Chapter 5 and the new Pathogen enemies have been removed from the files
Here is some stuff on the new classes tho
Radio has a small ground robot
Sharpshooter has his crossbows (I think this was also datamined back at launch)
Pyro/Torch has no model but has lots of animations for his abilities
Sharpshooter is the most finished of the 3, other classes are mentioned such as Lancer and stuff, but don't seem to be as complete as these.