Yeah I just had a look a TFW thread and went and had a look in my own game folder.
Each character seems to have 4 common files (Jazz as example)
TR_Jazz_ROBO_p.xxx
TR_Jazz_ROBODEF_p.xxx
TR_Jazz_VEH_p.xxx
TR_Jazz_VEHDEF_p.xxx
In the folder I can see
AirRaid
Barricade
Blastoff
Brawl
Breakdown
Bruticus
Bumblebee
Cliffjumper
Deadend
Demolisher
Dragstrip
Grapple? (might just be the grapple abilty)
Grimlock
Hardshell
Hound
Ironhide
Jazz
Jetfire
Kickback
Laserbeak
Megatron
Metroplex
Onslaught
Optimus Prime
Perceptor
Quake
Ratchet
Rumble/Frenzy
Scattershot
Scrapper
Schockwave
Sideswipe
Silverbolt
Sludge
Slug (Slag)
Snarl
Soundwave
Starscream
Swindle
Swoop
UltraMagnus
Vortex
Warpath
Wheeljack
ZetaPrime
Basically all the DLC they are intending to release are all ready on the disc. There are a bunch of characters that don't have 4 files but some of those characters are available in MP anyway so it's no mandatory they have those 4 specific files.
But yeah... my feeling is !@#$ you Activision and High Moon Studios.