There has simply not been much development recently on account of Blizzard's reluctance to increase the multiplayer map size soft limit. Apart from some balance adjustments (which were never announced before anyway), Zwieb just works on the ancient cave (which is GLORIOUS). I'm sure he'll present that in the forum when the basics are done.
It could also be that he doesn't have time to make carefully worded posts on a forum, which he isn't even obligated to do.
Anyway, there was plenty of hype and constant updates from Zwieb for 1.2C so this has nothing to do with the OP.