It should be pointed out that this is "Microsoft's Halo Team" which is not Bungie. Bungie is no longer a part of the company, but Microsoft still owns the IP rights to Halo.

Bungie is developing "Halo: ODST", to be released this year, as well "Halo: REACH" which is only at the teaser phase. Microsoft is developing their own game engine for their own Halo games.