I'm just hoping that Crouch really IS gone. I'd hate for him to show up in the next movies--the way the plot went in GoF, he could easily take the place of Bellatrix LeStrange, and I'd hate that. She's a perfectly twisted, evil character.
No chance. Barty Jr. was last seen in the company of Snape. He's gone. The movies delete characters, but they do not change any characters who are important to the plot.