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Well, now another possibility has been unearthed, with fan site TFW2005 reporting that Paramount has also registered a trademark and domain for Transformers: Age of Extinction - a title that would certainly seem to fit, considering the inclusion of the Dinobots.
Transformers 4 is set for release on June 27th 2014 with a cast that includes Mark Wahlberg (Pain & Gain), Jack Reynor (What Richard Did), Stanley Tucci (Captain America: The First Avenger), Nicola Peltz (Bates Motel), Bingbing Li (Resident Evil: Retribution), Sophia Myles (Underworld), Titus Welliver (Lost), and T.J. Miller (She's Out of My League).