It appears next month's free Games With Gold have been leaked a bit early. According to a post on NeoGAF, both Tomb Raider and BioShock Infinite will be coming to Xbox 360 owners with a Gold subscription.
Tomb Raider will be available during the first half of the month and will then be swapped out on March 16 for BioShock Infinite. Meanwhile, both Rayman Legends and #IDARB will reportedly be free all month long for those with an Xbox One.
Additionally, it appears Microsoft plans to sweeten the pot even further by offering double the amount of free games in April. While the Big M has yet to make a formal announcement, expect confirmation in the very near future.