I didn't know this topic existed, but since I played the MvC at TGS I might as well give my information.
(PS if any of this is stuff you guys already know then don't yell at me for it, I just don't feel like looking through 50 pages, most of which are from SRW, to find stuff like that)
- MvC3 uses 6 buttons, which are A, B, C, launcher, and two assist buttons. The assist buttons call the corresponding partner to help, yada yada yada.
- Apparently you input some sort of fireball motion and assist to switch a person out. I don't really know though since I could not do it for all the times I tried. My brother did, and that's what he said at least, but take this tidbit of information with a grain of salt please.
- If a super kills someone it does not stop the KO switch out. This means that when someone uses a super to kill his opponent, the opponent may be able to punish it depending on how the super acts. Dante multi-hit pistols super (I have no idea what it's called but I'm sure you guys can figure it out) suffers from this since the last hit of his super has a large delay. The only way I can think of that prevents this is wasting another bar of super to do a switch out super. I personally hope they change this.
- I'm sure you guys know of OTGs from launcher combos but I'll just put it here anyways.
I think that's all the info I can give, provided that I don't post again with something that I remember.
And before I forget this version is from TGS, which could have been a loketest for all I know.