And yes, Roccon, we'll be including the events of TPM in a prologue at the beginning.
As far as ROTS, we're splitting it at the scene of Anakin/Padme staring out at the Coruscant sunset. I think it's referred to as the "Padme's Ruminations" scene, so Empire ends on a cliffhanger for all the characters.
ROTJ picks up there and then starts with the duel in Palpatine's office, confirming in the opening scene that Vader was not lying at the end of ESB, that Anakin is, in fact, Darth Vader.