Looks like SEGA's trying to branch out of it's traditional gaming business overseas by aquiring the U.S. based online developer. With this move, the company said (Taken from IDG News :
"With this acquisition, Sega aims to aggressively expand its business in the rapidly expanding online game industry in the European and U.S. regions,"
And their next order of business is working on a RPG-style outing of the Doctor Who series.