First off I didn't even know this thread existed so it's awesome to see other TF Die Hards!
Now, I had the original and honestly? I think I'm a little disappointed that it's just reworking the original design. I'll be impressed if they can hide the robot sections better than the original but those pictures make it look like the EXACT same thing.
And finally, I just picked up the CW Devastator set and it's AMAZING....except for the lack of elbow joints on some of the robot modes and the black hands for Devastator....this was of course before I saw the Unite Warriors version which fixes BOTH problems. Ah well, still an awesome set!
If you don't mind spending some extra money, Perfect Effect makes upgrade sets for Devastator that fix a lot of the little problems.
One set handles a bunch of cosmetic stuff, including the hands, plus shoulder extensions, a more articulated shovel for Scavenger, an extending crane boom for Hook, and a "Prowlstator" head that will only make sense if you've read the IDW comics.
The other adds elbows.