As per the developers official support/PR person from this thread " A few dozen Cookie Jar scenes mostly on Jenny and Debbie, most of the original teacher content, and several other lewds. "After a quick test, the tech update really is an upgrade, the UI is slicker and more intuitive, and the game's smoother to play. But the question is about the content amount. Their website lists the tech update version as "limited content", which doesn't really say anything. How limited? What characters have routes, how far along, and what characters are still waiting their turn? Is there an up-to-date list or wiki that lists this info?
Which is almost nothing compared to the old version. This is a like a tech demo right now unless you are a fan of the few that are included so far.
The new version is also being developed at almost world record pace for slowest game development, so play the old version if you want a decent sized game.