thank you - that squares with what I heard as well.I ordered my 2016 TE (or the dealer "allocated" it) on April 1, 2016.
I believe, from what I've heard and small bit of research, that the TRD suspension is dealer-installed. Apparently as long as you order it direct from Toyota, and a Toyota dealer installs it, it's covered by whatever warranty you have (factory, or ToyotaCare).
I could be wrong -- if I am hopefully someone on the forums will correct me.
did you receive your truck yet?