Hola Hiendmuse
You have a very good preamp. Yes Mystere is still happening and there are new designs that will come out. He wants to implement some new ideas on laddered resistor volume controls. Like yours has.
PrimaLuna caught on much faster than predicted, and there was some heavy engineering that went on to meet some goals that we had. It's more work than you would ever believe. And Herman van den Dungen, the owner of Durob Audio, is a little ummmm detail oriented.
One example was when they listened to different fuses. We all agreed on Littlefuse brand type 213, 218, and 219. He has the factory order them, but he was suspicious of their being genuine even though they were in official packing. Didn't matter a hoot. He took pictures of the end cap markings, sent them over here, then got in contact with a Littlefuse Product Engineer. They go back and forth, only to find out yes, they were the genuine article. While this is applaudable, it really slows things down.
So a lot of effort is being thrown at PrimaLuna. And in case you don't know, Herman is the man behind Kiseki phono cartridges. That's quite an undertaking.