This corroborates a lot of developments over the last several years, as well as other independent statements over the last couple months. Anyone that didn't think they were working on 4 were pretty wonky in the head as the writing has been on the wall for some time. That's what made the fact it wasn't announced even more frustrating.
Anyone who thinks a major corporation isn't making a sequel to a franchise that has an install base with nearly 50 million units sold is delusional.
And if Blizzard thinks that scraping a game multiple times and taking 10 years to produce a sequel is "exciting news" for the fans, they're also delusional. The Blizzard Soon meme isn't a sign of quality anymore. Its an indication of "we don't know what we're doing".
I'm curious where you're getting the 50 million units sold number? The most I can find is 30 million, and that's D3 and RoS combined.
Either way I agree with you, Blizzard has no idea what it's doing anymore. They quite literally pulled their top guys from all their games to start working on mobile. So, get ready to not see anything great for the PC for years and years to come.