Hmmm... I'd say

Activators
Soundwave (new <- pics have been seen)
Cybertron Mode Ironhide (new <- pics have been seen)
Cybertron Mode Ratchet (remold < my guess due to above)
??? (new)

I'd love an Activator Wasp remold of BB w/a new head!

Deluxe
Arcee (new <- announced)
Soundblaster (recolour, or is that a remold/new due to Ratbat? <- announced)
Cybertron Mode Ratchet (new <- pics seen)
Rodimus (new <- rumored)
???

Voyager
Hydro BB (New <- announced)
Gold Grimlock (recolor <- announced)
Blackout (new <- announced)
Prime w/Jetpack (remold <- announced)

Ultimate
Omega Supreme!!!!!!!!!!!!!! (new <- hope)
Omega Lugnut!!!!!!!!!!!!!!!! (remold <- hope)