Seriously? The bigger fish are getting the next season of Encounters off the ground, seeing through the release of PotA, gearing up for the next big project after PotA, various work concerning Sword Coast Legends, attending the GAMA trade show, work concerning any other licensing deals we don't know about yet, signing off on finished material for next months columns, and making sure Greg Tito gets up to speed. I mean, I know they haven't detailed to us their long term plans, but the D&D website, Facebook, and Twitter have been constantly updating with news, projects, videos, previews of various media such as books and comics, all of which Mearls may not take a personal role in, but as Senior Manager of R&D has some hand in.
Or maybe, just maybe, one particular low-priority project that was being handled by one person was simply put on the backburner when that person went on jury duty, while all of that person's high priority projects have been re-assigned to the rest of the team.