Natal today is just for press/celebrities. The one we're going to see is the 2nd performance held on Monday night and broadcast Tuesday afternoon on MTV. You will not see the Natal event in its entirety live unless you're physically at either showing.
darknessbear,
According to Geoff Keighley the preshow is a half-hour long starting at 10 am pacific (11 M, 12 C, 1 E) only on the gametrailers.com website. The full press conference starts at 10:30 pacific on both the website and on Spike. As I said in a previous post, Keighley also confirmed an IPhone/IPad compatible video stream on the website tomorrow.