I had a chance to talk to Kevin Hayes about it during the CES in January and he said that the differences are small and mainly limited to the remote control (I believe you can now do source selection, the MKI only has remote volume control). The new model seems to have less gold plating on the face plate and fewer knobs. Kevin said they sound pretty much the same.
Vac Renaissance preamp MKI Vs. MKII
Can anyone thell me the differences between the MKI and MKII renaissance preamp. The VAC web site isn't helping much.