It is possible that they will be issued the new RABU's which are a lighter fabric with a high cotton content. The regular Air Force Clothing Sales are carrying this uniform over the older ABU.
Another option to compression shorts, is to wear the PT shorts under the ABU's (this also made superman drills a lot faster). My DD did this several years ago before compressions shorts became all the rage in BCT. DS last year had no problem using his black UA compression shorts during BCT. He did however hand wash them in his sink as he did not trust the laundry with them. He took 4 pair. Sometimes it is squadron dependent and that is why you are frustrated with the answers on the forum. There are so many different experiences out there, so you have options, and it can't hurt to take them, and eventually you will get to use them, even if it is not during BCT.