HL3 will be a huge money maker for them , I'd be amazed if they gave it away for free.
I suppose making it a Linux exclusive for some period of time might not be outside the realms of possibility. But I can't see what that would do apart from piss people off. Especially people who have no idea how to setup dual boot or who have hardware that isn't very compatible with Linux.
There may well be some perks for new Linux users, but probably more along the line of some extra skins for multiplayer or whatever.
I suppose making it a Linux exclusive for some period of time might not be outside the realms of possibility. But I can't see what that would do apart from piss people off. Especially people who have no idea how to setup dual boot or who have hardware that isn't very compatible with Linux.
There may well be some perks for new Linux users, but probably more along the line of some extra skins for multiplayer or whatever.