One of the recent trends I've noticed is that breweries are starting to come out with Triple IPAs. (In fact, there's a triple IPA week in the Seattle area.) But what exactly distinguishes the Triple IPA from a Double IPA?
[Note that this was not included in IPA and variants question, nor is it discussed in the IPA vs. DIPA sweetness question.]
Edit: This is decidedly NOT the same as the question regarding dubbels vs. tripels (which are Abbey-style Belgian ales, and remarkably different in style from a double or triple IPA).