Korg DW8000, Mono/Poly, MS-20...

All of us that own the DW-8000 know how old the unit is and most of us 
that have the Angel City upgrade know that that too has been around for 
a number of years.  My questions are: Has the Angel City gone through 
any upgrades? Is there an "improved" version or is it the same circuit 
as the original? If I purchased a newly manufactured board, is there 
any difference found in the more recently issued circuits offering new 
features?  

Don't get me wrong, this isn't a complaint just an inquiry.  My DW 
still is a wonderful (and highly prized) addition to my set-up and I'll 
admit that outside of using the extra voice storage, I really haven't 
scratched the surface of what my Turbo board has to offer.  I was just 
wondering if there were upgraded versions.  Thanks.