Very few changes, the most substantial being the final stages of making Reason 6 and Record the same thang. Which is great, for those who use both, I guess.
But the addition of the few effects units and no serious new synths doesn't make it worthwhile for me - Wavetable, Waveguide or even a DX style FM synth would be nice. Maybe something with some interest S+H type functions.
If you can't do a Wobble bass with Subtractor and you can't sidechain a kick with the build in compressor then idk. It's just a shortcut being offered so that they can capitalise effectively on the new demographic of bedroom DJ's who like dubstep.