Try it yourself by grabbing a demo version from here: http://www.propellerheads.se/go/D94BEDC0.
They are also offering Propellerhead Upgrade Value Packs through their PropShop
- Small: Reason Drum Kits 2 and Abbey Road Keyboards
- Medium: Reason Drum Kits 2, Abbey Road Keyboards and ReCycle 2.1
- Large: Reason Drum Kits 2, Abbey Road Keyboards, ReCycle 2.1 and Reason Pianos
According to blurb on their news site, here is what's new.
"Believe it or not, this is largest update ever to Reason. Version 4 comes jam-packed with features for quickly creating better sounding music. The new version boasts Thor, a highly sophisticated, superior sounding synthesizer; the ReGroove mixer, a new way to adjust the rhythmic feel of tracks; RPG-8, a versatile arpeggiator; a completely rebuilt sequencer coupled with many other workflow enhancements that give you the control and power to make great sounding music faster and easier than ever."
Visit http://www.propellerheads.se/ and click the Reason link for more info and to see videos of Reason in action.