Coca-Cola is test marketing Pibb Xtra in some locations in Texas (including Houston and Dallas), but judging from what some Pibb fans are saying, it may not stay around for long. This formula is different from Mr PiBB, but contrary to what you might assume.. this drink does not have xtra sugar, xtra caffeine, or xtra sugar. In fact, what this drink does is to do away with the stale MrPibby flavor resulting in quite a palatable beverage. I will refrain from a ranting on why I don't understand the marketability of the letter "X", and I will award Pibb Xtra a four Dr Pepper can rating.
The Ultimate PiBB site - Pibb Xtra page