To me, it's clear that Quin and MrLlama don't know anything more about the future of Diablo than just your average player. In hightsight, Quin and MrLlama were flown out there to make up for the lack of Diablo content. Not to hype the supposedly amazing Diablo content.
Until theres an official page on the Blizzard website, I wouldn't hold my breath for D2HD. Project Titan and Starcraft Ghost were widely known "secrets" and much development went into them. Only to have Starcraft Ghost cancelled and the project Titan MMO morph into Overwatch.
Nothing is real to me until there's an open beta.