Specs via Joystiq:
The Xbox One will include a Blu-ray drive as well as a 500 GB hard drive, Microsoft's Mark Whitten revealed at today's next-gen Xbox reveal event. The system will feature 8 GB of system memory, USB 3.0 ports, an 8-core CPU, 64-bit architecture, built-in Wi-Fi and HDMI in/out ports. Whitten also noted that the Xbox One's architecture uses three operating systems.
Smart of them to go with the 8GB of ram. Hopefully they were very smart and went with GDDR5 ram like the PS4 did, though.
I was really just waiting on hearing about the exclusives before deciding if I would buy both this and a PS4.. and it's literally nothing I would ever want. So, only Sony it is.