I was speaking to John Bright at Highland Outdoors, Howa have ceased production of all WSM calibres due to a court action, not certain if they are involved directly, but the Japanese manufacturers are really very conservative and won't entertain anything that might reflect badly on their products.
They won't even make a fast twist 223 Rem barrelled Howa they are all 1 in 12. I think WSM's have been a great success in the US and Browning are still chambering all WSM calibers, I have an A bolt in 300 Win Mag, it sheets really well for a light stalker, the Boss really takes the sting out of 72gr of N160 pushing a 165gr Nosler BT, had no complaints from Reds on Arran.