A quick survey of a few colleagues here in the states and in several other countries revealed that apparently the feature is already rolled out in many places.
To access the new Gmail add-on, simply click on the small 'lab bottle' at the top of your Gmail screen and then scroll down to page to this graphic:
Note: It may be quite a way down the page in some cases.
From there, the set-up is fairly straight forward and, at least in my case, provided one of the best new offerings from Labs (in Gmail) to date.
The complete post by Google's Octavian "Vivi" Costache can be found here.
The only question that remains .....
When is Gmail coming out of Beta ?? :)