If there are any hopes of a sequel, Im sure that Disney and Pixar will have to team-up again, they both retain rights as WK has said, so If they can let the small arguments slide I have muh hope for Finding Nemo 2, if it will be called that lol. Im sure they will work on a sequel with a completely different storyline or maybe not, but I think a new storyline is in order but who knows, it might end up like toy story where all they did was "re-play" the story...
Just look at the gross and net sales the Finding Nemo DVD has made, with those figures Im sure this heated debate between Pixar and Disney will turn into thin air.
Not much online about "Finding Nemo 2", practically nothing to search for.

:?
Will have to wait a while I suppose.