Between June 23 and Bungie Day 2011 on July 7, Bungie will be bidding a fond farewell to Halo, celebrating their 20th anniversary and-- wait for it-- revealing Bungie Aerospace:

Because we're going to tell you, in explicit detail, exactly what Bungie Aerospace is all about.

Lots of other celebratory stuff going on, so be sure to check out Urk's post for all the details.