CK2 has been THE game for me I've been waiting for the past 1,5 years. At this point I don't even care if it came with a PS3-kind of 70e price label attached to it, I'm still buying. So yeah, couldn't care less is Steam or not. However if I understand correct, Steam makes using mods impossible or at least more difficult, so I'll probably be buying from Gamersgate. That said, actual patches will be released for GG purchases of CK2 also, right?
I can now announce that CK2 will only be released on the Nintendo DS - we're also changing the name to "Crusader Kings 2 - Vasilius edition - because he's the most level headed fan on the forum"
/s