Worst kept secret in years but the fact that it runs OS X is pretty neat. Multi touch interface as expected from earlier patent discoveries, decent res screen(3.5 inch @ 160ppi I think he said), 8GB storage, 2Mpixel camera, 11.5mm thick, no buttons, accelerometer on board for more control interface fun, GSM Phone with GPRS\EDGE data, EDR Bluetooth 2.0 and 802.11b/g WLAN. Much more info at Engadget and Apple.
Gonna have to get one I think.
Edited to add: The screen is definitely not what normal folks would call a widescreen format - it's a 3:2 ratio so it has the same aspect ratio as NTSC at 2/3rds the resolution.