The rumor was that the FAA was not happy about a portion of the training and some lacking systems knowledge, and that there have been some issues on the line that they are not happy with. Something about unstable approaches and too many ASAP incidents in a short period of time (ATC violations on arrivals primarily).

I don't know if true at all, but that has been the work in the crew rooms in DCA and PHL for a few days now. I even heard people talking about it in PHX.