No beta here either. I must admit, I was excited when they said unsubbed vets could get an invite. As a player since 2005 and only recently unsubbed, I dared to hope. Serves me right :P
250 000 people in 3 servers means 200 000 on Lost Isles, which divided by 4 open zones means 50 000 people per zone...
In reality I think there is no more than 50-60 000 people with beta access.