My understanding from Danny is that the new 300B amplifier is still in development, not in production. It will not make the VM obsolete in any sense as a great (still best?) amplifier for the new two and three motor headphones. Remember, they are actually more efficient than the SR, so should rock on the VM. The new amplifier is also rumored to drive conventional headphones and will likely be more expensive than the VM was, as most 300B variants are. When I spoke to Danny recently, he said he still has ONE VM1a left for sale, the last one in the US. My prediction is the new Raal 1915 headphones will reinforce the value of the VM. Of course it is possible they may still be available in Europe as special order, I do not know this.
In the meantime, I am told my pre-ordered Magna will ship in 2-3 weeks, and I may also be getting an Immanis at the same time for photography purposes. I will be very happy to report back to all of you "regulars" here how they sound on the VM and vs. the SR1a, but Danny has already confirmed to me that they sound amazing on the VM and in my experience he's always right!