Take this with a grain of salt , but I’ve heard from 2 different people that have some insight into Blizz, say that they’ll be doing another wave of beta invites tomorrow.
You’ll, again, have to make sure you have an active sub to WoW even if you’re considered to be on the friends & family list you won’t get an invite unless you’re actively subscribed. No guarantees you’ll get an invite still, etc. But you might have a chance and it’s up to you if you want to try for a beta invite, just sucks you have to be subscribed to be considered for one.