Apparently, it is Baxter.
How can you tell who he is just from his back, and yes IMDB does claim Stockman will be in the film played by K. Todd Freeman, but remeber that site can be edited by anyone, and the same site claimed Mos Def would play Baxter Stockman and that Abby Elliott would play Irma which the screenwriter has denied.
IMDB at one point said Kevin Michael Richardson would be Hun in the 2012 cartoon, and that all of the 2012 cast would be reprising their roles for this film.
In other topics, it said Leon Kennedy and Kazuya Mishima were in Super Smash Bros. Brawl, and Mega Man in Marvel vs. Capcom 3.
So like Wikipedia, grain of salt. If you don't see it confirmed at a reputable source, don't assume it's true.
If Baxter Stockman is in this movie, he'll probably remain human even at the end. I doubt he'll turn into a mutant or even make himself into a cyborg later on.
Exactly! we should at least have a real source before we go assuming things