On one are close to releasing a fat bike anr are having their own tyres made
The tyres look interesting.
The bike itself is a massive disappointment (IMO) - the 170mm rear end will pretty much limit you to hubs from Hope and Salsa (both likely to be expensive), the frame is set up with vertical dropouts (WTF?!) which, given how many fat-bikers run singlespeed or IGH is a massive fail. For me, the 170mm rear spacing was a dealbreaker, and one of the reasons I bought a Pugsley rather than, say, a Mukluk.
The 'running 2 rear wheels' thing is kind of moot now, given that both the Neckromancer Pug and the Moonlander are running non-offset forks, but at least the option to upgrade (or side-grade?!) exists with the Pugsley.
I don't think the boys at QBP have much to worry about, even if On-One manage to get it within their price target (sub-£1000, IIRC)