Sossaman will be Intels dual CPU dual core Yonah platform. It seems SuperMicro already has a board ready which makes use of the E7520 server chipset. The dual core Yonah that will be introduced January 6th won't be able to run in a dual setup though, unfortunately it's unknown when the Sossaman chips that will have this ability will be released.
Not only did PC watch give us a nice picture of the board, they also had some benchmarks which can be found at their site.
Source: PC watch