Crystal Dynamics has "no plans" to release any single-player expansions for Tomb Raider, revealing that all of the game's DLC will be "based around the multiplayer experience".
(PC, PS3, Tomb Raider, Xbox 360)
Than why the hell would Microsoft pay for getting DLC first for 360. 95% of people buying Tomb Raider are buying the game for Single Player only. So the get content first on Xbox live is a waste compared to games like Skyrim & COD where getting DLC for those games first might actually matter to some gamers. Basically they wasted their money here, money that really could have been used for a new IP or a sequel to something like Killer Instinct.