I agree that the features of the Renn should have been part of the 5000. That would have been the logical step forward from the 4000. Not being standalone sucks. One of the best thing about MPC's or any hardware is the ability to be able to power it up 5, 10, 20 years from now and not missing a step. When software is involved this is not possible due to compatibility issues because you can't expect a company to provide software updates forever.
Hopefully it has drag and drop for audio and midi like Maschine. I have been tempted to sell my MPC4K but was worried about not being able to load and play track I made on it (Not a huge fan of Maschine's MPC program import (def gets the job done though).
Have you gotten your hands on a Renn yet?