For me it is all about legendary items. Weapons and armor with long histories. I'm not entirely sure what will and will not make it into the final cut, but here are some weapons I would love to see included. I know a lot of them have been in previous games (but what weapon hasn't?), and I am sorry if I don't know the history behind them all.
Axe:
Axe of Perun: The axe wielded by the Slavic god of thunder and lightning, Perun.
Hammer of Hephaestus: The hammer of the Greek smith-god Hephaestus which was used to make the Greek gods weapons.
Daggers:
Carnwennan: The dagger of King Arthur in the Welsh Arthurian legends. It is sometimes attributed with the magical power to shroud its user in shadow.
Setan Kober: "Devil of the grave". Near its completion when the empu tried to infuse the kris with spiritual power, he was disturbed by a crying demon from the graveyard. As a result, although powerful, the kris had a temperamental evil nature that caused the wielder to be overly ambitious and impatient.
Taming Sari: Translated as “flower shield,” Taming Sari was the fabled weapon of the legendary Melakan warrior Hang Tuah. Taming Sari was unique in that it did not have a sheath, as Hang Tuah considered his enemy’s body to be the only appropriate sheath.
Hammers/Maces/Flails:
Club of Dagda: This magic club was supposed to be able to kill nine men with one blow; but with the handle he could return the slain to life.
Mjölnir: Self explanatory.
Sharur: "Smasher of thousands". An enchanted talking mace. Not only could Sharur talk, it was also sentient, offering the god advice on powerful enemies, gathering information wherever it could.
Polearms/Spears:
Amenonuhoko: Shinto's genesis gods Izanagi and Izanami were responsible for creating the first land. To help them do this, they were given a spear decorated with jewels, named Ame-no (heavenly) nu-hoko (jewelled spear).
Cronus' Scythe: Cronus castrated his father Uranus using an Adamant sickle given to him by his mother Gaea.
Death's Scythe: A large scythe appearing in the hands of the Grim Reaper. This stems mainly from the Christian Biblical belief of death as a "harvester of souls".
Gáe Bulg: Fashioned from the bone of a sea monster. When Gae Bulg pierced a man’s body, these barbs would open up, making the spear nearly impossible to remove without killing the victim.
Green Dragon Crescent Blade: A giant of a man, Guan Yu asked his blacksmiths to make a polearm that combined the chopping power of a saber with the length of a spear. Believed to weigh as much as 45 kilograms (100 lb), no normal human would have been able to use it effectively.
Gungnir: The spear of the god Odin. Made from the wood of the world tree Yggdrasil.
Kongō: A trident-shaped staff which emits a bright light in the darkness, and grants wisdom and insight.
Lance of Longinus: The lance that pierced the side of Jesus as he hung on the cross.
Ranged:
Gandiva: The divine bow was said to be able to defeat 10,000 warriors at once and was only held in the hands of heroes.
Ichaival: A bow possessed by Odin. Another source said it was came from Ydalir, the home of the god Ullr. It possessed the power of each pull of just one arrow, it will release ten arrows.
Shields:
Aegis: Perseus used this shield to look at Medusa's reflection so he wouldn't be turned to stone. After killing Medusa, Perseus returned the shield and Medusa's head to Athena, who fastened it to the shield so that any of her enemies would be turned to stone.
Priwen: The shield of King Arthur.
Staves:
Caduceus: The staff carried by Hermes or Mercury.
Rod of Asclepius: A serpent-entwined rod wielded by the Greek god Asclepius, a deity associated with healing and medicine. (Could be used to heal)
Ruyi Jingu Bang: Magical staff wielded by the immortal monkey Sun Wukong.
Swords:
Claidheamh Soluis: "Sword of Light".
Durendal: The sword is said to contain within its golden hilt one tooth of Saint Peter, blood of Saint Basil, hair of Saint Denis, and a piece of the raiment of the Blessed Virgin Mary, and to be the sharpest sword in all existence.
Dyrnwyn: "When drawn by a worthy or well-born man, the entire blade would blaze with fire."
Excalibur: Everyone knows this sword.
Fragarach: Known as 'The Answerer' or 'The Retaliator', was the sword of Manannan mac Lir and later, Lugh Lamfada. It was said to place the wind at the user's command and could cut through any shield or wall, and had a piercing wound from which no man could recover.
Gan Jiang and Mo Ye: A pair of swords forged with human qi.
Gram: The sword that Sigurd used to kill the dragon Fafnir.
Harpe: The sword used by Perseus to decapitate Medusa.
Hrunting: Beowulf’s sword.
Joyeuse: Some legends claim Joyeuse was forged to contain the Lance of Longinus within its pommel. "by his side hung Joyeuse, and never was there a sword to match it; its colour changed thirty times a day."
Kladenets: Russian - "self-swinging sword". A magic sword in numerous Russian fairytales
Kusanagi-no-Tsurugi: Found in the body of an eight-headed serpent killed by the god of storms and seas. It’s part of the Imperial Regalia of Japan, icons of the ancient imperial family’s descent from the sun goddess––the symbols of their divine right to rule.
Masamune: In contrast to Muramasa’s cursed swords are the blades of legendary priest and swordsmith Masamune. Legend has it that Masamune and Muramasa held a competition to decide the superior smith by placing their blades in a stream. While Muramasa’s cut everything it touched, Masamune’s refused to cut anything undeserving, even the air.
Muramasa: Imbued with a bloodthirsty spirit that—if not sated with battle—would drive the wielder to murder or suicide.
Shamshir-e Zomorrodnegār: "The witch mother of a hideous horned demon called Fulad-zereh used a charm to make his body invulnerable to all weapons except this specific sword. Shamshir-e Zomorrodnegār originally belonged to King Solomon, and was carefully guarded by Fulad-zereh, not only because it was a valuable weapon, and indeed the only weapon that could harm the demon, but also because wearing it was a charm against magic. A wound inflicted by this sword could only be treated by a special potion made from a number of ingredients, including Fulad-zereh's brains." (I think it fits with the game's theme)
Skofnung: Renowned for supernatural sharpness and hardness, as well as for being imbued with the spirits of the king's 12 faithful berserker bodyguards.
Tyrfing: "The dwarves made the sword, and it shone and gleamed like fire. However, in revenge they cursed it so that it would kill a man every time it was drawn and that it would be the cause of three great evils."