we can't tell unless we are in the beta, and i am not sure on the release of a raze 2 sometimes, in a beta, they won't let you talk about the gameplay outside the beta, so you probably won't get to many responses.
any way, i think raze is going to be more of the same, while exit path 2 will bring something wholly unique to the table.
I LOVE Raze! The music is amazing! I do hope they make more music like it. I tried exit path, but i didn't like it that much, it jammed quite a bit, but i'll try again Anyways, a zombie mode on Raze would be good, as well as maybe a map editor, or something "original" (evil, maniacle laugh, to show impending doom...) with zombies. I want a zombie surprise! (more laughs...) urckle gurk...