Check out Crossovers Captain America pictures here at The-Arker.com.

Next, we have Masterpiece Grimlock (also known as MP-08) Crossover Mickey Mouse, Encore Combaticons, and a whole bunch of Encore Cassettes (Ratbat, Buzzsaw, Eject, and Rewind). All these pics can be found here.

Finally, we have some possible spoilers from the Transformers Live Action Movie Blog. I won't repost them here, but be warned. :) Find them here.