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Version 1.3 (The big engine change)
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WHEN!?
VS Mode (Local/Online)
Chaos Mode (Local/Online)
Some clarifications from Question:
Yes. Split screen.
Double miriams.
The co-op mode is not a playthough of the regular game.
No crossplay, if that's what you're asking.
Two more major updates. The content from the previous roadmap still applies, just the timing is (obviously) different. Costumes are likely with the first update. CM2 will be its own update.
My own speculation for Chaos:
Rereading and putting these together, I've changed my opinions about what to expect.
So currently expecting either:
With enemies/bosses dropping gear, probably a range tiered to the enemies/area you're fighting. This gear will most likely be completely separate from your full game savegame gear, and basically something you can reset each time you start this mode. Basically build up power through a run.
Not sure what shape the sub goals will take, I'd guess at specialized maps/areas where you can trigger traps or other mechanisms, even unlocking for more enemies to make it harder in order to gain more gear.
In coop, both players will play Miriam, and probably no other characters (as the balance would be out of whack). No idea how the loot would share between 2 miriams, they might have to compete for the same gear options.
Essentially, it sounds like this would like like a Randomizer mixed in with a boss rush, likely with some more common enemies inbetween to give more drop rates.
https://www.youtube.com/watch?v=3X_54wp1xiU
https://playbloodstained.com/upcoming-content-preview-and-special-announcement/