no one at red has told us yet how the fixed lens package will use batteries but the battery module and side handle are both not part of the package.
The redmote is cheaper so they added that (i think its better that way), so thats why no side handle but we are still just waiting for more info.
the redmote pro appears to have a dial of some sort which I am guessing looks like it could be used as a follow focus for electronic lenses. This would be huge because the redmote is wireless and an AC could pull focus without even being next to the camera itself. If my guess is correct I would think that alone would be enough for the price increase but I am sure more features than that are included