The news is here.
If you’re an author with either of these two imprints, I would check your contracts for reversion clauses.
Likewise, if I were the folks at Angry Robot, and were putting the books in these imprints into “out of print” status, as it seems likely they are from the announcement, I’d be thinking of immediately reverting the books back to the authors, so they can either find them new homes or self-publish them. Because that seems the decent thing to do after cutting the legs out from the income potential of those books for those authors.
There’s the possibility that the latter of these might be complicated by Angry Robot’s parent company having problems of its own. In which case: This is why you have writers’ organizations, folks.