Honestly, I hope they won't change the voice actor for both the original and the dubbed version. Many people consider Tobi and Obito to be two completely different characters, it's one of the biggest complaints. Keeping Tobi's voice actor for Obito is something that could potentially fix that a bit, and could also make his lines sound less bitchy in the anime.
I believe if they change the voice they'll go with Vic again.Obito is one of the better English voices if you ask me. It won't suit him once his mask breaks (although we're many episodes away from that). Besides, I think they'd either just switch actor or they'll just make their current actor sound like a whiny little crybaby - whatever works.
They'll most likely change Obito's Japanese voice too.
I believe if they change the voice they'll go with Vic again.
0:52
[video=youtube;Nq4HKL_2Q7o]http://www.youtube.com/watch?v=Nq4HKL_2Q7o[/video]
Isn't it Obito's voice in Kakashi Gaiden dubbed version? Vic? lol