Jedi Defender has a look at some Episode 3 product design.
It’s certainly not subtle, but then what in Star Wars ever is?
RUMOR: Voice casting?
Gary Oldman is rumored to be in talks to do voice work in Episode 3. There is information in the link that may provide possible spoilers about characters.
The official site posted a production update concerning additional photography, with a new photo of Anakin. There are possible location spoilers in the link.