The Sci-Fi Fantasy Network is reporting that, at a Doctor Who event, the fourth Doctor himself, Tom Baker, announced that he would be doing a voice in "Star Wars."
The quote from their report of the Day of the Doctor's convention:
“I’m going to be in this new Star Wars thing, you know?” he told eager fans as he signed his autograph. “I’m going down to recording some voices for this new character they’ve created for me, very soon.”
The report goes on to speculate that he would be voicing a character on "Star Wars: The Clone Wars," though that show has been cancelled for some time. Although it's possible he could be recording a role for "Star Wars: Episode VII The Force Awakens," it seems much more likely that he'd be recording a part for "Star Wars Rebels." At this point, though, it could be nothing more than the ramblings of a wizard, just a crazy old man...
It wouldn't be the first time "Doctor Who" and "Star Wars" crossed over. 10th Doctor David Tennant won an Emmy for his part on "The Clone Wars." He played Huyang, a robot employed by the Jedi for most of a millennium to teach the skills required to build lightsabers.
Other actors have crossed over between the two series over the years, even from the Tom Baker era. One of Tom Baker's most formidable foes in "City of Death" turned out to be General Veers, played by Julian Glover. Captain Panaka (Hugh Quarshie) was featured in Doctor Who. Even Grand Moff Tarkin, Peter Cushing himself, played the Doctor in two movies.
It's an important reminder that this news is not confirmed and no official announcements have been made.