Have you guys seen that sweet picture of Sidious? It's the newest Before the Helmet. I can't post it or send it to anyone but that is awesome! It looks like the hologram in ESB, but of more of him. It's now obvious that Palpatine and Sidious are the same person, if there was ever any doubt for anyone.
It says he's talking to separatists on Mustafar. Hmm, maybe Obi-Wan and Anakin go there to stop the separatists, and end up duking it out there? That would make sense.