Talked to a friend who was in the April class. He was told that he would be put in a pool for up to year.
That'd be what I'd expect. The situation is very fluid right now.
They still don't have a good handle on how many will retire at 60; there are >20/month reaching age 60. According to our SSC (system scheduling committee) report for January, there were a total of 2 retirements. I've been waiting to see the Feb SSC report, but it isn't available yet.