heres the URL to the offical SB press release
SB Press Release on the Riot

I note the comments in the press release about price ($US399) and availability (pre-order now, available late Feb).

The software that comes with it makes it Mac compatible as they bundle iTunes [for the mac] and they also bundle RealJukebox for the PC crowd.

No mention of the weight or dimensions though or if the hard disk can be used as a file taxi [a logical application given its 20MB hard disk].

The battery life seems similar [using a rechargeable LiOn battery like the iPod] to a iPod and the Built-in FM radio should also make it a useful device (can't recall if iPod has a FM radio).

Software is upgradeable in the unit too.