1st Du down, 1st tri coming-question

Ok I got my birthday Duathlon finished today-The Fall Classic Duathlon in Purcell OK. I'll post a real race report when the full results and times are posted. I am reasonably ok with the results although I had hoped for better, but took almost two weeks off leading up to the event.
 So now I am registered for the Cooper Fall Out triathlon in McKinney Texas-3 weeks from now. I have been swimming some and I know I can go the distance, not concerned really with the time just the experience-however:
It is advertised as a "heated outdoor pool". I'm not sure I have ever encountered such an animal. it is November and in the morning. I'm guessing wetsuits are not the norm in pools anyway, nor do I own one. It just seems  cool to me. Perhaps it isn't bad at the start but running out to the bike while wet sounds chilly to me. Granted this is Texas, but it could easily be in the 40's 50's-occasionally colder. So what can i expect, how should I prepare/dress etc?