Features of the Game.

There's been some discussion of this in the release date announcement thread, but no concrete answers yet. From what's been insinuated, though, it sounds like we'll get some idea about some of this by the end of May in a Kickstarter update.

I hope most of it is at launch, and the creators I believe have suggested in the past via polls that that was their goal, but who knows now after all the delays. I feel with WayForward involved, Classic Mode might have at least been completed, but time will tell.

At the same time, however, myself and many others don't want all of the surprises of these modes spoiled, so if there is an update, I hope they don't show off all the modes.

I think it's likely they'll release a lot of the stretch goals as staggered content. While I and most people would have liked it to hit all in one go, the release date is much earlier than most people were expecting...as you'll recall from a lot of my posts both here, on Reddit, and on the Discord, I thought the June 18 release date leaked early was another wrong date and was expecting it to arrive in July at the earliest, more likely August. If they're releasing in June--and this is actually earlier than they promised, because Summer technically starts on June 21, not June 18--I'm not sure if they would have had the time to complete all the bonus content.

Realistically I think we'll see at least the two extra playable characters, boss rush, cheat codes, difficulty modes, and music based goals. The majority of those are things that would be easy to put together with existing assets and were regularly seen as bonus features in Iga's previous games.

That said I'm really hoping we get Classic mode out of the box. From the get go it's been the one bonus mode I was really excited for, and with Curse of the Moon wetting my whistle for Classicvania action I need more.

I talked about that before on the other thread, let me say it here too, with a bit more detail. Time for wild guessing:

What I THINK it is most probably going to be in the game from the get go, how certain things will be unlocked and what will probably be released later, on a staggered content / free download form:

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MAIN GAME: The game itself, obviously.
SECOND AND THIRD PLAYABLE CHARACTERS: both characters being unlocked by finishing the game once.
NIGHTMARE DIFFICULTY MODE: the game will have a Hard mode (you can see that at PAX EAST 2019 video). Such mode will be unlocked by finishing the game once. And then, i believe, by finishing on Hard Mode, you will unlock Nightmare mode.
CHEAT MODES: unlocked by finishing the game once. You will most probably need to discover these cheats by yourself, or by finding tips about them on a second play or something like that.
LOCAL CO-OP: unlocked from the start. Special areas of the game, built to be played by two players. At first, only Miriam will be avaliable for both, but the other characters will be unlocked here when you finish the game once.
NEW BOSS: most probably just an additional, secret boss (IGA Boss, or something like the Forgotten one from Lament of Innocence), that will be avaliable from the beginning.
SPEED RUN MODE, BOSS RUSH MODE: all unlocked by finishing the game once. 
RETRO LEVEL: a certain mandatory part of the castle that is designed on a 8 bit / 16 bit fashion, for some weird plot-wise reason. Being there from the beginning.
8 BIT MUSIC: Either you can find these songs (like those song LPs you could find with Shanoa on Order of Ecclesia) or they will play at the Retro Level. 
IGA'S BIGGEST CASTLE, ORCHESTRATED TRACKS: part of the main game, obviously.

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CLASSIC MODE, ASYNCHRONOUS ONLINE MULTIPLAYER, ONLINE CHALLENGE MODE: will probably be avaliable from the beginning when it is added.
ROGUELIKE DUNGEON, BOSS REVENGE MODE: will probably unlock after you finish the game once, after being added to the game.

That's what i think.

I'd be content with the usual features Igavanias always had. Then again, I don't care at all for pretty much all of the extra modes so it's kinda obvious I wouldn't be bothered if they came later. In fact, I'd be happy because that would mean that all of the time until now went to develop a robust main game, though I do realize it's a pretty selfish way of thinking because there are people who look forward to extra modes.

BloodyTears92 I'd forgotten about that. This might be clarified in the next update.

I am hoping the existence of cheat codes will not lock us out of getting trophies.

If it's silly cheats like big head mode or something I wouldn't mind codes not blocking trophy progression but something like a god mode cheat should block trophy progression, otherwise obtaining the plat wouldn't mean much of anything.