I've gotta say I agree with it being a placeholder for the EP title.
TS4 has a naming system in place somewhat, so just "University" would fit that, as well as "Get to University" or "University Living".
DIscover University sounds a lot like (as others mentioned) one of the blurb taglines. "Discover University: Your Sims will find x and y in their brand new education stage, as well as party and (whatever else they're gonna add in the pack)".
The official names are usually saved for official announcements and reveals, so stores that get sale info so they can prepare get work-in-progress titles for their data. I'm surprised it wasn't just TS4:EP08 in the system to be honest.
For all we know, it's gonna be a Get Educated or Get to School pack after all.
