I'm guessing they are playing with the freighter numbers.
We where supposed to get some more BCFs and the ERFs. They are probably talking about holding on the BCF conversions, and I wouldn't be surprised if we see a bit of a slip in the freighter delivery schedule. Either the ERFs or the -8Fs.
Most likely, the Classic fleet will be retired sooner than anticipated and all those guys will probably be mixed in to the 400F fleet, which will make the freighter very well staffed.
I know that NAM is overstaffed with FOs, so I am not surprised that they cancelled some interviews. I've heard of some NAM FO getting 20 days off without leave, most are only being blocked for 40 to 60 hours.