From my very limited understanding, and with my NyQuil-addled, mucus-filled brain, here's what I can say:

What Pumpkin Studios is still operational, though on a very limited budget. There's also that animation project, so Hussie has been busy, even if these efforts fly under the radar.

The bigger issue is that Andrew is in a situation where he has to retain his copyright over the Homestuck IP, and that's driving some litigious behavior toward fan projects. American IP law is messy: it essentially requires IP owners to actively defend their work against infringement, or those infringing can continue doing so without legal ramifications.

This gets rough, because the very nature of Homestuck is collaborative. I think that's why the projects for viewing MSPA offline in all its Flash glory have been targeted with takedown notices. To me, it reads like an effort to sort of retcon the project down to a select few creators Andrew still works with, while limiting the ability of the other artists involved to have a stake in things.