Make sure you handle a TL3 before you buy (or any action for that matter) to make sure that you like it. If you like how it feels and it's features, then go for it. I wouldn't bother waiting for SHOT products - good chance you won't see it for a long time if it's revealed at SHOT.
I bought a TL3 for the wife prior to handling one, based on the rave reviews that they get. We both hated it. Excessive bolt slop made it terribly easy to bind. It doesn't feel like a premium action - not compared to my DLC'ed Mausingfield and Defiance actions. My wife has some rather choice words for the TL3.
Try before you buy. Don't wait for SHOT.