Halo: Spartan Strike
From Halopedia, the Halo wiki
Halo: Spartan Strike is an upcoming isometric shooter video game and the spiritual successor to Halo: Spartan Assault, developed by 343 Industries. The game is set for release on December 12, 2014 on Windows devices and Steam for $5.99 (US).[1] The game will be set during the events of Halo 2.
Synopsis
Set in New Mombasa in 2552, the narrative follows the recovery of an artifact the Covenant are searching for. Five years later in 2557, the narrative continues the search for the artifact in New Phoenix and on Gamma Halo.[1]