teharri said:

I was recently trying to put together a trailer for ROTS that was to act as if ROTS was the third movie coming out. The trailer would not focus on anakin/vader story. That transformation would be the big shock of the actual film. This trailer would almost be there to trick people into thinking something else was going to happen.

You mean like the opposite of the Terminator 2 Trailers? If you watched T2 only knowing part 1 and without knowing anything about part 2 you would still think Arnie is the bad guy until he actually meets Connor. But the Trailers ruined that (except for the wonderful Teaser (I really love those Teasers that consist of material, that was made only for the Trailer. The Teaser of the last Star Trek comes to mind)).