If X-kira is to be trusted (he's about 50-50 so far on his calls),
here's a big PDF of everything that's been found via datamining since launch:
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Arcade mode is fully programmed into the game, and is just waiting on Capcom to add in data to be fully functional. It has 10 stages, with a rival battle, a final boss at stage 10 and possibly a bonus stage or two.
- Likewise,
the Arcade version of the game (set to run on Taito Type X machines) is also mostly programmed into the game.
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Stages have code in them to be customizable in time and weather, but it looks like this function was dropped in favor of Extra Stages.
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There is some sort of V-Mode select coded into the game for characters. It's unsure what exactly it does, but it's supposed to change attributes of the characters (likely for new V-mechanics).
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Extra Battle is going to be much more than just fighting NPCs. Matches are going to have way more challenging rules than most modes. Imagine Survival Mode, but with forced handicaps ranging from no blocking to limited CA to one-hit kills.
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Dojo mode exists, or at least did at one point. Based on what few lines of code exist, it seems to be a cross between World Tour mode and a special Tutorial.
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There are two more stages programmed into the stage select screen. More stages than that are coming, being Shadaloo Corridor (an extra stage for Shadaloo base, seems to be the Ibuki/Mika vs Boxer stage from Story mode), Cammy's SFII stage, and a stage seemingly related to Ibuki.
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Bipson, Karin, Ibuki, and Guile are getting new costumes.