If you had any doubts about the Samsung Galaxy S hitting T-Mobile as the Vibrant on the 27th of June, well, your doubts were well founded. The embargo apparently ends at midnight on the 28th! We know this becauseT-Mobileclue.com is counting down to that very second, and we know that the puzzle from that site - pictured first below - is referencing the the Vibrant because David over at TMoNews (who else?) has the solution to the puzzle posted as his website (second image).
I have a feeling that David has taken the wind from the sails of a few Magenta marketing reps, not to mention the person(s) that created the actual puzzle, but it's a nice confirmation leak. Other clues have been dropped via T-Mobile USA's Twitter account, and include references to a library of books; probably regarding Amazon's Kindle app.