I feel like I have outgrown games like Diablo and WoW. I was looking forward to GW2 several months ago, but now it doesn't excite me.
The game I currently looking forward to is:
http://0x10c.com/
It's notch's next game (the creator of minecraft). It's a space sandbox. I like these sandbox games (like minecraft) where you get to create things. It's very engaging. And a space sandbox will allow me to go full-on trek nerd.
Games aren't fun for me unless they exercise my brain, and modern games are doing that less and less.