Someone posting under the official American Top Team account on the Underground forum at MMA.TV is claiming that ATT fighter Marcus "Maximus" Aurelio has signed a four fight contract with the UFC. Official accounts are certified by the moderator on the UG so I'm fairly confident that the source is accurate.
Aurelio is 14-4 and most recently appeared on several Pride Bushido cards. He has excellent Jiu-Jitsu and holds wins over Rich Clementi, Dokonjonosuke Mishima, and Takanori Gomi (although Gomi defeated Aurelio in the rematch the last time he fought in November).
I believe Aurelio has competed at 161 pounds in Pride but is more likely to cut to 155 pounds in the UFC as opposed to going up to 170. This isn't a major signing, but it's a good one and adds depth to an already deep UFC lightweight division.