Both Optimus (the new one) and Bumblebee voice changer helmets have been posted to one of the asian websites, in packaging.
http://www.tf08.net/forum/viewtopic....79023c27c1a8c5

Packaging lists the voice phrases each says (3 for Bumblebee, 4 for Optimus).

Also, maybe a spoiler, the packaging for Optimus mentions protecting something that isn't the Allspark, but the Gen1 equivalent (the Matrix)... which I think is odd if it is now part of the Movie Universe.