Well...
- a ROM that is DOUBLE in size (which
means either more sounds or better old sounds), - the new styles from the SD5/SD3 (which are the best Ketron ever made, even if you don't care for the riff feature, that the Midjay plus now has),
- more DJ Loops,
- a 80 Gb hard disk...

I wouldn't call that "not much"...
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.