Look, I don't know. I DON'T KNOW. This could all be a terrible trick, a plea for attention, and I'm very sorry for adding to the rumour mill.
Fansite Blizzplanet links to a different fansite, Diablo3.com, which is currently hosting a rather noisy countdown timer. It currently reads 13 days. Until what? "until half the web links to Diablo3.com. But why???", it says. I'd take it a lot more seriously if it wasn't for those two offensively extraneous question marks, I have to say.
It's a stunt that will presumably pull over traffic in droves (honestly, you don't need to click through to it yet. I've just told you what's there. Head over in 13 days instead). So there'd damn well better be a Diablo 3-shaped pot of gold at the end of this spurious rainbow. Of course, it helps that we have had other hints Blizzard's long-awaited RPG sequel is hiding just over the horizon. In 13 days, perhaps we'll know.
Or we'll just be very, very angry.