I just found this out yesterday.  Powertap has discontinued the Evne 45mm and 65mm G3 carbon wheels.  They will continue to carry the SES 3.4 and 6.7 Enve G3 carbon wheels.  The biggest difference in the change is that with the 3.4 and 6.7 you cannot buy just the rear wheel.  They will also continue to carry the Powertap Reynolds 46mm G3 wheelset.  Below are some pictures to help clarify the change.  As a consumer you should be able to find a couple sets of 45mm/65mm wheels for the next 6 months as dealers continue let go of stock.