I'm getting my 2nd generation T1s repaired just now (one of the bass drivers had lost power - they're years old by now), and have taken the opportunity while I have them on email to ask a few questions - the customer service is consistently great in my experience - these are my favourite company in any market or business anywhere I have to say.
Richard says, "We are hoping to have our first batch made and ready for purchase in March. The Evoke universal will replace the T15 once it launches. It uses the same driver as our custom Evokes/T3 which is a step up from what is used in the T15 and it can still be used with our pro moulds as custom tips. We will also be launching an Evolve Universal later this year which has the same drivers as the custom Evolve/T1."
That was an answer to my direct question on the T15 replacement (you'll probably be able to pick those up cheap now). Interested to hear about the full range though - PRO Impulse Universal, Evolve Live! Universal, Evoke Live! Universal, Evolve Studio Universal, Evoke Studio Universal (entry level).
The Revivo pictured in the first post by the way - it prevents moisture getting into the silicon and prevents damage to the drivers, and the new models have wax guards with a repellent coating that prevent any wax getting into the workings. Nice to see the product being refined generation by generation.