He also seems to be up for reprising Obi-Wan in the new Trilogy. It'd give us a chance to see Obi-Wan's Force ghost as a younger man (and possibly even one that can morph into Alec Guinness using modern CGI) and have Ewan interact with Mark Hamill the way the late, great Sir Alec once did.
Unless Lucas, Kathleen Kennedy, Abrams and/or others have different ideas the new Trilogy would be the perfect excuse for both Ewan and Hayden to return as Force ghosts along with a CGI spirit Yoda to give advice and moral support to Luke and other leaders of the New Republic and revived Jedi Order.
Anybody who thinks they've seen the last of Hayden as Anakin Skywalker is probably deluding themselves whether they liked his performances or not.
As much as I hated the prequels, I actually would
be up for seeing McGregor's Obi-wan again. He did such a good job with the role, and it would be kinda cool to see him in a great, kickass SW movie. Whether on some further adventure on Tattooine or in a flashback to the Clone Wars.
Hayden's Anakin on the other hand? Not so much.