Just to add to Greg's post below, Microsoft has issued two enormous press releases over the last 48 hours, both coming straight from the company's X06 event in Barcelona. One covers those announcements, the other a list of forthcoming games showing at the event.
As Greg mentioned, Peter Jackson is producing two titles for Microsoft including, as expected, the next Halo, plus one original new franchise, 'targeted at bringing new audiences into the captivating world of interactive entertainment'. Hmmm, King Kong SingStar? Jackson will be working with Academy Award-winning screenwriter Fran Walsh.
And the rest...
Greg got there first, but there will be a new RTS offshoot of Halo, adequately named Halo Wars, developed by Ensemble Studios, creators of the Age of Empires.
Some stuff that Greg didn't mention: Rockstar announced that two downloadable episodes of GTA IV will be available on Xbox Live a couple of months after the full retail release, each boasting 'hours' of new gameplay. Splinter Cell 5 (currently subtitled Conviction) will be an Xbox 360 exclusive. Project Gotham 4 is in development.
Finally, the HD DVD player will arrive in the UK in 'mid-November' with a suggested retail price of GBP129.99. The player bundles with the King Kong Movie and a remote.