It's not listed on boxrec anymore and I recall reading some iffy article on the ESB front page that Wlad intends to sue Fury but I don't recall why. So what is happening? Officially cancelled or just indefinitely postponed? What happens to the tickets already purchased?
God knows what's going on behind closed doors. It seems that Fury is trying to change the terms of the agreement he has already signed. He probably thinks he's getting banned soon so wants a bigger payday before he disappears for a while. I doubt Wlad will budge, it's likely Fury will be stripped at some point, either because of his ban or because of inactivity as he's forced on to the side lines by not honouring his contract with Wlad.
Nothing official as UKAD won't release information on anything until it's all resolved. But Fury's legal team says that the B sample was negative. Though with Fury's recent history of lying about the whole thing, I'd take that statement with a huge pinch of salt. Because under UKAD own rules if a B sample comes back negative the athlete is cleared, which clearly isn't what has happened.
He was still suspended by the British Boxing Board at that time if I recall correctly, so he couldn't have fought then either.