I was wondering the same thing...
I would guess the are keeping the entry level TT's smaller under the SLX line.
Many floor plans were very similar between the Swift and Jay Flight. Also, to most people, floor plan is the most important thing when deciding what they want in a TT.
I decided on the Swift for the reduced price over and did not see a great increase in quality or standard equipment.
Just my thoughts....
2014 Jay Flight Swift 294 BHS
2012 Silverado 2500HD 6.0L