lol, maybe Sean Connery can fake a different accent. THAT would be different.
...I mean, Elijah Wood, Viggo Mortensen and lots of others faked their accents in LotR. It would be weird hearing Sean Connery's iconic voice somewhat altered immitating another accent. I can't imagine this happening.
My top choices for the role of Aslan would be James Earl Jones (it would be interesting to hear someone who has done one of the ultimate villain voices in cinematic history do someone who may become one of the ultimate hero voices in cinematic history), Christopher Lee, or possibly even Sean Connery. I really can imagine him pulling it off.
Sort of off topic, but wouldn't it be cool if Frank Oz did someone? I mean, the legendary "Muppet" voice of Yoda, Fozzie, Miss Piggy, Animal, Grover, etc. doing some Narnian animal would be classic! I could see him doing one of the animals like Shift or Puzzle.