Yay, time to speculate!
Switch+ and switch-, both with improved processors (smaller transistors?)
Switch+ would have the same size, and improve the screen to 1080 and let it a little larger. Runs the dock preset on portable mode (you can optionally turn of to drain less battery), better screen and larger battery. Still 300$. Marketed as the improved version of switch.
Switch- would be smaller and slimmer and controls attached, with the better battery. Comes with a mini dock (finally a official release of a nintendo made mini dock). Runs only portable preset, even when is on dock. 200$. Marketed for portable players and second switch for those who already have one. All acessories work.
The current switch would be priced at 250$.