i think Soundwave should be on the list because he looks almost completetly different from tf2. i cant wait to see Soundwave in action.
All you base your selection on at this point, is the design and possibly any spoilers you may or may not have seen. That being said.. guess I would have to pick Wheeljack, Mirage and to a small degree Sentinel.
Shockwave is one of my favorite transformers so I voted for him. Also from what I readed, Sentinel Prime does come off as a interesting character and he be my second vote.
I have to go with Wheeljack too, maybe he'll put sam witwicky's mind into autobot x... (GeeWun Reference)