Kaivo is a new synthesizer from Madrona Labs. It takes some of the latest research in physical modeling and puts it into a user-friendly interface. Kaivo is a deep well of sounds. Coming this fall!
There are a few other physical modeling synths out there - Logic Studio's Sculpture is one, also Applied Acoustics (AAS) do several physical modelling instruments.
Whats your favourite?
Developments for Korg's instrument have been slow but promising.
Revisions that turned synths into brand new machines