Not sure if anyone here has watched StarKid Production's previous works; their most famous was "A Very Potter Musical," which (unsurprisingly) is a Harry Potter-themed musical performed while the group was in college together. It's been about 4 years since the original came out and went viral on youtube; probably the most famous person from the series is Darren Criss, who played Harry Potter and wrote some of the music, and went on to play Blaine in Glee.
Anyway, previously two musicals had been uploaded, but the group discussed how they had a complete script for a third, named "A Very Potter Senior Year." Last summer they performed a live stage-reading + songs at LeakyCon, and today it's being uploaded to youtube at 8PM (Eastern). Almost all of the original cast returned for it (including Darren Criss), and Evanna Lynch (who played Luna Lovegood in the HP movies) guest-starred as Luna in this one.
If you haven't seen the musicals, I recommend checking them out (as well as some of their other works: "Me and My D*ck" was pretty hilarious too).
Edit: Probably should mention that the comedy is probably at least PG-13, so it might be a bad idea to introduce to your (young) kids.
Edited, Mar 15th 2013 4:07pm by LockeColeMA