I think id learned a lot from Doom 3 and no doubt they know about the feedback people gave them. Doom 3 sold quite well from them, but was critically neutral. I think once they release some footage and tease some stuff out there, people will start to drool.
I'm wondering which game between Doom 4 and Rage will have more multiplayer focus, or if they'll have substantially different approaches. MP is the key for future earnings, id knows that. I really hope and wish they bring in some better MP, refining the Quake 3 "gold standard" deathmatch to a new level. Worked well for Capcom and Street Fighter 4.