(No, not a title that ends in a question-mark. It more like "Iconic Actor from Doctor Who is Coming to Star Wars Rebels", but that would have been too long a title.)
The rogue Jedi Kanan Jarrus meets a force-neutral being called "The Bendu", who represents a balance between the force. This encounter is tied to the spiritual journey of Kanan and Ezra. He is going to be voiced by this magnificent bastard:
(Although a SW/DW crossover would be rad as hell, I'm still content with this. Plus, if Baker spends eight hours reading form a phone book, I'll hear it in its entirety; hanging on to his every word.)
When I was a kid in the early 80's our local PBS station would show the Baker DW at some ungodly, witch-haunted hour... I think it was either two or two-thirty in the morning. On the rare occasions I could stay up that late I was enthralled by their unflappable weird heroes and sheer, unabashed oddness, and I thought I was a big Doctor Who fan.
Then years later I saw other episodes, and learned that no, I was not a Dr. Who fan. I was a Tom Baker fan.