Korriban and Dantooine are the ying and yang of the KOTOR saga and should stay but i think that korriban should be changed to you see more of the city and not the enclave.
as for dantooie it should stay and the caves should be a hideing place for the jedi, and to make it awsome why not have the girl and boy that you save from the two main familys the 'administrators' of dantooine at the time. and they are suplying reven when he comes back into the known reagons yet only they know.
only a wacky idia....
Never the less Korriban and Dantooine SHOULD STAY!
"the dark side leads to death and destruction but the lightside leads no where!"