The following is from a TF10 review from 2006. Definitely seems to imply that they came out that year, and I've seen lots of similar stuff which is why I was under the impression they came out in '06. *shrugs*:
Early in 2006, earphone rival Shure dropped a bomb, debuting a miniaturized $500 triple-driver earphone that required no custom fitting session and promised similarly outstanding sound quality. The result, Shure’s E500PTH (iLounge rating: A), was a superlative design, widely satisfying all of iLounge’s editors despite their varied sound and comfort preferences. Engineering enabled the new triple-driver design to fit snugly in the nook of your ear right outside the middle ear canal, providing even more enticing sound than the more expensive UE-10s.
In recent months, Ultimate Ears representatives began to hint that they were poised to respond with their own one-size-fits-all triple-driver canalphone, code-named triple-X, and over the last few weeks, the company promised a more aggressive price point than Shure’s. The finished product arrived last week with an impressive $400 sticker and new name: the triple.fi 10 Pro, a blending of the triple-driver UE-10 Pro label with that of super.fi, the company’s lower-end universal fit earphone series.