Did a little googling myself. Another forum that I don't visit:s....only popped up because I googled it.....had someone post that they got an online survey from the moco that was looking for opinions on marketing and there was a picture of a "switchback" but no model year attached to it. It was a dyna wideglide with detachable hard bags, tall sissy bar, detachable windshield, and a 103 motor. The poster thinks the "switchback" name refers to being able to switch between a wide glide and a touring configuration kind of like the cvo softail convertable.
Who knows.....we'll all see the new models in a few weeks but it is cool to speculate!