This is what Gmail says about this....
However, we realize that after five years, this leaves some of you wrestling with some tough questions. How will you ever get used to using Gmail without that familiar grey "BETA" text greeting you when you log in everyday? What example will you cite the next time you make an Internet joke about perpetual betas? Don't despair... for those of you long-time Gmail-ers who might feel some separation anxiety, we've got a solution. Just go to Settings, click on Labs, turn on "Back to Beta," and it'll be like Gmail never left beta at all.
However, we realize that after five years, this leaves some of you wrestling with some tough questions. How will you ever get used to using Gmail without that familiar grey "BETA" text greeting you when you log in everyday? What example will you cite the next time you make an Internet joke about perpetual betas? Don't despair... for those of you long-time Gmail-ers who might feel some separation anxiety, we've got a solution. Just go to Settings, click on Labs, turn on "Back to Beta," and it'll be like Gmail never left beta at all.