It's been 30 years since the D-50 was released, and now Roland has shrunk it down to Boutique size. All the factory patches are there, as well as the Roland expansion cards. 16 note polyphony, the PG-1000 programmer from the 80's will work with it, and all the patches can be swapped into an original D-50. They've added an arpeggiator and sequencer on the D-05.

I'll probably pass on this since I bought a clean D-50 a year ago, and the Roland patches and pretty much all the third party sounds are out there for free. D-05 will be $350, shipping in October.