The ex got 2 pieces removable rubber mask
Just by what was printed and pics it looks like the rubber mask is the only difference. Meaning with the regular you get two heads with no rubber mask.
No release date scares me 'cause I don't really want it to come out soon. It might, though.
My guess is the both rubber masks are removeable, but only the exclusive version comes with the heavily battle damaged one.
After cancelling two things today I ended up ordering 3 things, including the ex. of this!
I'm thinking it's two heads and the EX has the removable mask that can be put on the robot head.
Going by this photo, both masks can be removed from the Endo head.