From a recent Japanese hobby magazine are some finalised colours for some upcoming Prime toys - Voyager Breakdown, Voyager Starscream, Knockout, Vehicon... but it's the Breakdown that's most interesting, as it appears to be out in Japan before America (if Hasbro release it at all).
The Micron partner is a Rhino. Knockout's is a Crab, Starscream's is an Eagle, while Vehicon's is apparently a Boar.
(Knockout looks nice in a shiny red, compared to the two-tone red of the Hasbro version)

The scans also include news on MP12 & MP13, which is already being discussed here.