Did anyone else listen to the Dave Filoni chat on RebelForce Radio?
Click here to see the hidden message (It might contain spoilers)
George thought Korriban sounded too much like Coruscant, so he proposed Morriban. Otherwise it was going to be Korriban. They designers actually made the planet look like Korriban because that's what they intended. Dave did give the EU and out by saying they could always establish that the planet has two names.
As for the Darth Revan appearance, that was a Force illusion spawned by the Force Priestesses as a test for Yoda. The shadow snakes things also fall into that bucket. However, beyond that, when the Sidious vision happens, that's all Yoda and beyond the Priestesses' control.
Thus, Bane looking different, could be explained away a little, as this is sort of an interpretation of how the Priestesses viewed Bane.
George didn't like the existing designs of Darth Bane, so he had them come up with some new designs to see if they'd work better. Dave and Kilian Plunkett came up wiht the new design.
"I believe toys resonate with us as humans, we can hold them them, it's tactile, real! They are totems for our extended beliefs and imaginations. A fetish for ideas that hold as much interest and passion as old religious relics for some. We display them in our homes. They show who we are. They are signals for similar thinking people. A way we connect with each other...and I guess thats why I do toys. That connection." -Ashley Wood