Thanks to Neo-Bombshell of the 2005 Boards, we have a possible confirmation of the recent “Beast Hunters” Trademark. According to a document he’s sharing with us via Google Docs, the new Trademark is the title for the upcoming Transformers: Prime Season 3. It is stated that we’ll get to see it in Fall 2013.
Also it is worth noting that Hasbro has plans for Transformers: Prime even beyond 2014 and Transformers: Generations will go until 2014.
We are yet to hear more about the upcoming season and the proposed IDW tie-in comics featuring Prime incarnation of the Dinobots and the recent Thundertron may even play a pivotal role. You can view the PDF formatted document via a Google Docs account Neo-Bombshell is sharing. He is also kind enough to translate the document and has posted at the thread.