Damn. I was so looking forward to seeing the Xbox die once and for all.

Ah well, I'm sure that sooner or later it will die anyways.

And for those of you positive that the PS3 will dominate, you must not be a longtime gamer. If anything has proven true over the years, it's the simple fact that the dominant console tends to change from one generation to the next.
Genesis -> Saturn
NES -> SNES
SNES - > N64
Just because Sony has been leading for the past 2 generations doesn't mean it will carry over to the next. To the contrary, it seems that Sony is making some very risky moves. The Cell is going to be a real nightmare to code for I am sure, and Sony might very well make a console that's even more precocious than the PS2. Sony is not well known for having decent launch titles, while Nintendo is. If all the consoles launch simultaneously, I think that Nintendo has a really good chance of kicking butt.
The GameCube has earned back the respect of many people who lost faith in Nintendo during the N64 era.
The Playstation 2 has continued to break down, and warrant replacement every now and then, continuing the legacy of the PSX.
The Xbox has firmly dissapointed many of its fans. I look around and see it losing userbase all the time.
At the end of this generation, I think that the PS2 and the GameCube will both be remembered fondly. That is going to create a fresh slate on the battlefield for the next generation. If Nintendo gets out the door in time, then they might just stand on even territory with the PS3. It's really the launch titles that are going to make the difference.
Sony is no doubt going to be featuring a promise for more Final Fantasies, and GTA, which they did with the PS2. Launch titles will likely be entirely 3rd party. As a result, I can't speculate what will appear.
Nintendo is no doubt going to be pushing for more support from Konami and Square, and might very well show a similar lineup in aspect to the PS3.
Launch titles on Nintendo's console will likely include some good 1st party games, and probably something from Factor 5. Silicon Knights will likely be present this time around, even if their game is out a couple of months after launch. Silicon Knights seems to be becoming Nintendo's trump card, and I can't see Nintendo letting such a perfect chance of sending SK mainstream slip them by.
As for Xbox 2, I would pretty much count on Halo 3 being shown in video form. At launch they will likely have a couple of PC ports, as has been the trend for the Xbox.