Obsidian has already stated they WOULD LIKE to do KOTOR 3 and LA insiders has suggested they would like to continue with the franchise.
At any rate, let's just say that it is Obsidian that is making K3, LA still has them on a very short leash....once the project is announced, I suspect the devs will open up a forum for it like with PNJ....heck, how long has that forum been open? And still, not much meat in there.
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IIRC, Feargus said in a NWN2-interview that if they were allowed to do a KotOR III, they would use the same engine as NWN2.