I think this will be the first product of another range above the 500, starting with a power amp. There is a chase for the Eastern European money and statements nowadays. If I recall in 1986, the vintage of one pair of my 135's, they were £800 each do the maths and RPI suggests nearer £4k now, not sure how far beyond £6k the 300's are now but pricing is ahead of where it could be given material costs over the years.
I have no intention of buying, and if I did it would go on brands other than naim, but nice to see product investment in our small industry from the bigger Brits