quintiq
I just spoke to Adrian @ Sonore, and he said they hope to have the new OpticalRendu out by this fall. They have had supply chain issues and the parts costs have gone way up. It will be about $500 more than the current OpticalRendu.
In the meantime, I will upgrade my power supply for my MicroRendu (which I love) to the Sonore external supply (about $800!), which I can use with the new OpticalRendu when it comes out. Adrian says upgrading the power supply (from the SGC external PS) will be very noticeable.
It seems wise to make the leap past the UltraRendu to the OpticalRendu, though with the better Sonore power supply I would probably be very happy with the Ultra also. I am running an SGC Sonictransporter, which imo is excellent.