Halo: Spartan Assault for WP8 coming first to Verizon for $6.99

In Halo: Spartan Assault you will play as Commander Sarah Palmer or Spartan Davis, and Xbox 360 owners who play Halo 4 can also earn additional experience points for their Spartan Career by playing the mobile game and acquiring certain weekly achievements.
There is no word yet on when the game will be released, but Verizon has said the game will cost $6.99 and be made available in the Windows Phone Store.
source: Verizon