but that is based on what the BOT has said (funding is there, no issues with P5 growth, etc). However, even P5 conference won't detail everything. BOT and BYU have counted the "cost" of acceptance into the P5. That was done a while back and when I say that I mean they knew within a frame work of what and how.
Details from P5 will be coming, but BOT is very well aware of that is going on with P5.
2018 BYU existing ESPN contract is over, finished. 2019 a new contract will be signed, how much uncertain, but the "framework" for that is in sight and has been for a while. There is "room" for BYU and the wiggling needed is fine, BOT approved.