There's an interesting story today on videocardz, though unconfirmed it seems that some pretty hot upcoming titles will get Mantle support. The list is divided into 3 groups: games that are released, unreleased, and games that are not yet confirmed to support Mantle, however developers have signed for private AMD beta program. The titles include GTA5, Lara Croft and the Temple of Osiris, COD:AW and Sleeping Dogs: Triad Wars. Mantle support for COD:AW and GTA5 would be a huge thing for AMD.
As Videocardz reported:
While the third group has still Mantle support pending, the second group is confirmed to support new API. Here you can find Star Citizen, Sims 4, Rise of the Tomb Rider, Mass Effect or Star Wars Battlefront. Thanks to AMD partnership with EA/DICE and Oxide Games, Mantle may finally become a real competition for DirectX.