DLC to expand a little on the story and then Rage 2. I can't wait. Honestly this year between all the new games I got CODBO, Dead Island, Fallout NV, Duke Nukem Forever, Bullet Storm, Killzone 3, Portal 2, Catherine, Battlefield 3, and Rage.
Rage is the only game I have bothered to play through twice. Rage is just (in my opinion) the most fun game this year. I share the anticipation with the OP. I did have some more games on my "to get list" before the year was out. MW3, Batmam AC, and House of the Dead Overkill, But seeing as this is the only game that has satisfied my game lust this year I am holding out for Rage DLC and Rage 2 to avoid any more disappointment.
Here's hoping for DLC that adds more Wastland legends and more Road Rage Maps, maybe Road Rage racing not just combat.
And here's Hoping for Rage 2 that will continue the story so that I can stop wondering
Spoiler what the Authority intends to do about all the new arks emerging and then stop them