The bad news is that Percula recently updated the video's YouTube description to let everyone know that no, a sequel is not planned for the video. He says that he was laid off earlier in the year and had to quit WoW to focus on finding a job, and in the time since, his interest in the game has waned. That's the bad news!
The good news is that he still plans on making other animated videos, just likely not WoW-based ones. And for those interested in seeing what he's come up with between the release of BLIND and now, he says to look for upcoming Id Software releases, which he had a hand in.
Too bad about the discontinuation of the series, but at least this means that we won't get a hojillion tipline emails for BLIND II, right? A boy can dream.