RUMINT, but the last I heard from a guy who did the whole one-on-one phone consultation with AFPC after the last board was:
1. They're going to mask year groups going forward. Essentially, once you meet your IPZ board, you'll continue to be treated at IPZ until you get out.
2. One line PRFs, forcing the boards to actually look at your whole record.
3. Quarterly awards were apparently a discriminator on the last LtCol board. Plan accordingly if you want to stay.