Direct from Yahoo! themselves…
Q) How can you tell if you are out of Beta?
A) If you are still unsure about whether or not you are actually out of beta, just take a look at the Yahoo! Mail logo in the upper left corner of the browser window. If the “BETA” is gone, you have already been migrated over.Q) If I’m still in Beta, when will I be switched?
A) We are in the process of rolling it out to everyone, but because of number of users it could be anywhere from this week, to as long as six weeks. We’re trying to get it done as quickly as possible, but there are a lot of servers so please be patient.
To see Yahoo’s Party and Celbrations of the Launch: Launch of All-New Mail is Bigger Than Life
Adam Aaron Hirsch 
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