It wasn't a joke.
They really did.
All the stuff I said yesterday is completely true--including the bit about how the nerdrage-provoking sucknesses the web keeps telling me are in 5e doesn't seem to be in any of the stuff they've sent.
I hasten to add that nothing in my contract obliges them to listen to me so, y'know, don't blame me if it turns out the resolution's all done on a d9 and the only viable class/race combo is owlbear monk.
Anyway, should be a pip.
Now back to work.