I love the Paper Mario series and Paper Mario: The Thousand-Year Door is easily one of my favorite GCN games. With the new Paper Mario game being the first RPG game in the series since 2004, I'm definitely going to pick it up sometime this year.
Another game I was really excited about is the Ratchet & Clank Collection, but that port is ridiculously buggy to the point where its bugs caused me to stop playing it. Here my favorite gaming trilogy from the last generation gets 1080p ports of all three games and it's a buggy mess. Hopefully patches will eventually fix many of the game's issues. Otherwise...
As for other games I'm really looking forward to playing that are coming out or have come out this Fall, everything else are either ports (Jet Set Radio, Nights into Dreams, Sonic Adventure 2, and Okami HD), they were postponed to 2013 (Luigi's Mansion: Dark Moon and Sly 4: Thieves in Time), or they're from a system I'm unlikely to own for a long while (Pikmin 3, New Super Mario Bros. U, and Rayman Legends). 2012 has been a crappy year for original games. No wonder the release of Borderlands 2 is such a big deal. I plan to get that game someday when it's dirt cheap on Steam. I still haven't played through the first game yet but from what I played of it at a friend's house, it was pretty fun. Now that I've mentioned which 2012 releases excite me, what games are you guys looking forward to that are coming out this Fall?