I've got plenty of other apps functioning quite well-post update. Apparently they got the memo from Apple.
These things don't happen overnight. They are done with,a I would guess, a fair amount of communication, planning and common sense. Not being ready, not notifying users is nothing short of irresponsible. It's not the end of the world, by any means. Nonetheless, my confidence is shaken by a company that seems as surprised by updates as I am.