FWAAA - even if the FAs do not get a raise, 1) all other labor groups are getting a fairly substantial contractual increase (pilots are getting >10%!), and 2) all labor groups (FAs included) will become more senior this year, meaning the overall average rate WN pays each of its labor groups will go up even without any contractual increases.
WNforlife - little known fact: if WN believes it is "reasonably likely" that they will have to pay their FAs more and that this pay increase will be retroactive, WN must start accruing for that expected increase today. So, buried in WN's labor cost somewhere is an accrual for an expected pay increase for the FAs. Of course, how much that "expected" increase might be is a secret that I'm sure WN management would like to remain pretty well-kept.