What's wrong with people? Seems like everyone is in attack mode in here.
Back on topic,
What I expect from the reveal is:
-Glossing over specs, nothing too specific
-Kinect 2.0 demonstration w/ games like Ryse + showing off how you can navigate dashboard and search for stuff.
-Big publishers announce partnerships with Microsoft.
-Call of Duty reveal for the first time, timed-exclusive DLC returns
-New IP for next-gen. Based on the recent leaks, I expect a new family game, a zombie game and Forza 5.
-Pre-orders start on the same day. $500 price point without any contracts or subscriptions.
-Expanded Xbox Live subscription tiers. Maybe something like "Free, Silver, Gold'