In the game "Minimum System Requirements" only windows version needs 1.5 Ghz processor,mac and Linux need 2,0.What the hell.Is this gonna be like console conversion from Xbox > PC :P .I'm definitely buying this game.Anyway does anybody know what engine and does it use OGL on all platforms.
They use an engine they've developed themselves. There's a bit of info on it here: http://www.frictionalgames.com/site/node/42
The new game is using an upgraded version of the engine.
I found the answer to why I thought you could have your pre-order show up as a Linux one- I clicked on the buy button, then the Linux tab, and it shows you where you can get it (which is only their store).
Their site says if you pre-order from their store, you get access to all 3 platforms on launch.