Brian,
You may need to give it some more time.
B&K has a very large worldwide sales network of dealers.
Dealers at this time are at tooth and nail just to get some of their fair share of pre-orders filled.
B&K is building all the new product in smaller runs at this time. They have a huge backorder to get caught up on.
My local dealer has around forty Ref 50's on pre-order alone. He has been getting maybe 3-5 every other week or so. And for him to get these few, he needs to plea and beg.
Remember B&K rolled out much more then just the Ref 50,
They have those two new AVR 507-505 receivers,
The new PT-5 pre, and a whole new line of amps!
What is it that you need to know?
I have the Ref 50 in my system.
I'm not one to make big fancy long reviews.
I have found nothing lacking in the performance of the Ref 50, (Not even one firmware/software bug so far)

Although I have not spent much time playing with it.
If you search B&K at AVS you will find a few current discussions about the Ref 50.