Yesterday, Square Enix registered the name of a new game based on the spin off of Lara Croft called "Lara Croft: Relic Run".
UPDATE:
Crystal Dynamics confirms the new game!!
"Some of you super sleuths unearthed a recently registered domain with a familiar name - looks like the relic is out the bag! We'll have more news on Lara Croft: Relic Run, a nostalgic Lara Croft adventure coming to tablets and smartphones, soon"