Beyond Skyrim is certainly not inactive. Well, some provinces are, like Valenwood and Morrowind. Those were put hiatus, due to there only being one or two people working on them. But it looks like Morrowind might be up and running again soon. Cyrodiil, High Rock and Hammerfell are active, however. And Cyrodiil will indeed release Bruma and the Jerall Mountains sometime in April/May this year. I encourage anyone who feel like they can contribute in any way to join us. And if you've never modded Skyrim before, then that fine, we'll teach you (when I first joined, I had very little experience in exterior design and now I'm "Environmental Director" for Cyrodiil.). Cyrodiil is currently in need of level designers (exterior designers, specifically) and armor/weapon modelers and creature modelers. But we'll accept anyone.
That's probably because most of the progress happens in the private forums, which are only visible to project members. I'll bring it with the other project members and the admins that we should open up our forums more, so people actually can see the progress we're making.
EDIT:
We also have a Twitter and a Facebook page that we update regularly.
https://twitter.com/beyondskyrim
https://www.facebook.com/BeyondSkyrim