Maybe it's a regional thing, because it's HUGE here.
Every gas station has posters all over their windows for it, wal-mart has giant displays in the front of their store, and I haven't found a single vending machine on campus that doesn't stock it (usually in more than one slot).
Maybe we're the test market or something, but it's definately everywhere here.
And yep, it's a Coca-Cola soda.