The only thing REF 18 will still be based on V3. They will make larger power supply, split the boards, and have nicer aluminum. The only thing i am wondering is if it will sound better much better for $8000. That is a large step up from Buying used V2 and upgrade to V3 for $800. You can buy new V3 for 5K. Looks to me like REF 18 should be much better amp, i hope!!