(not a surprise). There won't be a lot of chances for upgrades or possibly even new season tickets holders.
Luckily, I am good with my seats from last year but will still check when it's my time.
For those who don't know, if you login to your BYUtickets.com account it will let you view the current availability. Top right quadrant of the screen it will say "Selection Process" then 2024 Basketball Season Ticket Renewals." This only works if you were a previous season ticket holder and have a time slot.