I wouldn't sweat the model year too much. There is really nothing dramatically different... No technology break thrus etc.
There may be be some different floor plans... But that is not always a good thing. My present TT floorplan is no longer made in the same class as the one I have. To get a new one like it, would mean a downgrade in a lot of areas.
So I focus on the right TT for me... If that happens to be this years, next years, or last years model, it makes no difference to me. I'm gonna have it probably 10 years or so.. Having the right TT is much more important than having the latest one out.