What's the new reason like jimmy? Haven't downloaded it yet but probably will, needa hook up my midi keyboard again
The new Thor synth is sweet, very powerful with some fantastic presets. I haven't tried programming it yet (looks complex) but I'm going to get some massive sounds out of it when I do.
The sequencer has had a major facelift. It's still quirky compared to traditional sequencers like cubase and sonar, but in a good way. I think they took some tips from Ableton's sequencer.
The arpeggiator is an excellent addition. I've been using it a lot with Thor to ge some seriously badass basslines and leads.
I haven't really tested the regroove mixer. Seems good enough, but I'll need a little practice to get the most from it.
Overall it's a huge step up from Reason 3 (still easy on the cpu, too!)