A new episode of Transformers: Prime, called "Operation: Breakdown", premieres tomorrow on The Hub at 7pm EST. The description for it is "The Autobots roll out to rescue Breakdown, the Decepticon, who has been kidnapped by Silas and the sinister agents of MECH." No idea if this is the beginning of a cluster of new episodes or not. Screenshots from the ep can be found here.
On a related note, ToonZone has posted an interview with Transformers: Prime (and G.I. Joe: Renegades) executive producer Jeff Kline. He discussed how they developed the series and hinted at future plans. The full interview can be found here.