I made a bunch of lists tallying confirmed characters and unconfirmed characters, and made lists of names per game. Probably useless, but hey:
Confirmed character's franchise debut:
Capcom characters - top
Marvel characters - bottom
X-Men vs. Street Fighter:
Marvel Superheroes vs. Street Fighter:
- Captain America
- Hulk
- Spider-Man
Marvel vs. Capcom:
Marvel vs. Capcom 2:
Marvel vs. Capcom 3:
- Arthur
- Chris Redfield
- Dante
- Nathan Spencer
- Zero
Ultimate Marvel vs. Capcom 3:
- Doctor Strange
- Hawkeye
- Nova
- Rocket Raccoon
UMvC3 characters not confirmed / not returning:
X-Men vs. SF:
- Akuma
- Storm
- Magneto
- Wolverine
MSH vs. SF:
- Spider-Man (A lock-in. Hes fricking Spider-Man)
MvC:
MvC 2:
- Felicia
- Jill Valentine
- Tron Bonne
MvC3:
- Albert Wesker
- Amaterasu
- C. Viper
- Hsien-Ko
- Mike Haggar (rumored)
- Trish
- Viewtiful Joe
- Deadpool
- Dormammu (rumored)
- MODOK
- Phoenix
- She-Hulk
- Super-Skrull
- Taskmaster
- X-23
UMvC3:
- Frank West (rumored)
- Nemesis (rumored)
- Phoenix Wright
- Vergil
- Ghost Rider (rumored)
- Iron Fist
Number of confirmed returning characters per game:
- XvSF: 2
- MSH vs. SF: 5
- MvC: 7
- MvC2: 9
- MvC3: 15
- UMvC3: 20
Number of UMvC3 characters not confirmed / not returning
- XvSF: 4
- MSHvSF: 1
- MvC: 1
- MvC2: 5
- MvC3: 26
- UMvC3: 32
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- Less than half of the MvC3 roster (15/38) and half of the UMvC3 roster (20/52) is confirmed.
- Only Capcom characters are confirm to return from X-Men vs. Street Fighter (Ryu and Chun-Li).
- Out of the fifteen MvC3 newcomers, only six are confirmed to return.
- Of the twelve UMvC3 newcomers, counting rumored characters, half of the Capcom debutants and all but one of the Marvel debutants (Iron Fist) will return.