This subject has been discussed numerous times -
http://www.nasaforums.com/viewtopic.php?f=39&t=110611. And while I enjoy speculation and planning as much as the next guy, the simple fact is, a spec series is unlikely to happen at the club level until 5-7 years after a car is launched when it's value falls significantly on 1st year models. I can't speak for other sanctioning bodies, but NASA isn't exactly looking to increase its class counts. In fact, the contrary is true as we are currently pushing to consolidate lots of classes. Until such time when there are more 86s in a given class (PTD/PTC) than other competitors, it would take some serious backing from TRD or Scion Racing for this idea to materialize.
On the subject of contingencies and TRD backing... I've been in conversation with Kevin Kutcha at Toyota for months now, and can categorically say that TRD has no immediate plans of supporting a one-make series or even providing contingencies for wheel to wheel racing. I'm still pushing every month with emails and phone calls to all parties involved. Scion Racing Canada just launched an extensive contingency program with incredible payouts last month, and hopefully this will push Scion Racing USA to consider offering something (although neither Kevin nor I have had an actual response to date from Scion Racing USA on the subject... still hopeful). Unless of course you know something I don't.
For the foreseeable future, the twins just need to be built to run in whatever class they fit in, per the sanctioning body and region closest to you. SCCA T4, NASA PTD, USTCC, etc. The more caged race cars we get on track, the easier it will be to attract interest from other racers and 86 owners. In a few years, a spec series could happen... but I would not begin working on a ruleset today, unless you want me to build my car exactly like yours so we can give each other crap about how slow the other is.
FYI: My door bars go in next week and then my cage will be done, so catch up.
