He's alive an well. Forge World has released an Errata and FAQ for Betrayal and the dual plasma Moritat is allowed. Away go my clippers. Bigred, your second plasma is safe.
A few other obvious issues got fixed sensibly: Legion Champion's rule, Librarians' power weapons, and the Allies chart.
One big change that I like, but that doesn't exactly make RAW sense to me is the change to Cataphractii Pattern Terminator armor-- they no longer confer Slow and Purposeful to their squad. I'm glad they changed it, and I wish GW would change Slow and Purposeful in the main rule book.
To me this seems like a smart update. Is there anything else you noticed as a big change or something they missed?