and coming soon, Madden NFL 2010 for linux...
How about a game of football?
<joke>I have received information from a reputable source that DKF will be a linux only title.</joke>
Well, I don't know of any exclusives, but I sure know that there are plans for a Linux version of DNF (they'll need all revenue they can get off that title)
Linux only title would anyways be bad. This way it would not be any better than people doing windows exclusive or platform-xyz exclusive... still leaves a large group of people outside in the cold.