Everytime I read anything from those guys, it's all just a bunch of words, hype and promises.
Maybe they should make more public-facing updates about individual features and changes in their software, but (as is hinted to in their post) it seems like they are limited in their resources.
The Diaspora guys have the really-actually-unique challenge of developing an open-source project entirely in the open coupled with attention and radically differing expectations from thousands of people. It's kind of nuts, really. Would you want to be in their position?
They started digging a hole for fun in their backyard. Then the Army Corps of Engineers showed up, gave them some cash, and told them to divert the Mississippi.