It all over the web, Team Fortress 2 will be available on Linux through Steam as reported here and here.
I'm a FPS kinda-guy having played Wolfenstein: Enemy Territory and Return to Castle Wolfenstein (retail and demo). When Enemy Territory Fortress (remake of the Quake 3 Fortress) came out circa 2004 I fragged a bit on it.
Fast forward 8 years when a buddy got me into TF2. But TF2 was (is) a Windows game and I run Linux so ended up having to setup a Windows 8 Preview virtual machine on Xen using VGA passthrough just to play it...
It came with a cost though... all my plans with Xen running tons of domU aimed at global domination have come to a stop: I'm addicted to TF2 and spend most of my limited free time on it :P