yeah there is a sizable amount of new content in DR2:OTR for sure:
- remixed story with new missions and dialogue
- new survivors and scoops
- photography is back, new collectibles - PP stickers
- the DLC outfits from DR2 which grant special abilities are unlockable in OTR
- new old moves, Frank's badass moves from DR1 are back (Knee Drop

)
- new area with new items and shit to do
- sweet ass clown car with farting butt
- 10 or so new combo weapons
- whole new sandbox mode with tons of challenges
- 50 NEW ACHIEVEMENTS
really looking forward to getting into some co-op with Chronovore

I LOVE DEAD RISING