I broke down the significance of this signing in a (FREE!) post over at Inside Texas that includes some nice quotes from Ehlinger himself.
He's a very unique player who plays with a chip on his shoulder like so many young, scrappy little QBs the Big 12 has seen such as Colt McCoy or Baker Mayfield. But unlike those guys, Ehlinger is already 6-2, 220 coming out of high school.
Sam runs like a fullback between the tackles like Tim Tebow, but he's a much better passer than Tebow was at this stage in his career and perhaps a better passer than Tebow was coming out of college. Should be a fun fit for Tom Herman's offense.