As for the album, it's very Dr. Luke/Max Martin-y, which—if you're like me and thought "Hot N Cold" was the best thing off Katy's last album—is good. Best songs: "Firework," "Last Friday Night" and "Pearl" are the standouts.
Anyway, best moment from the preview of Katy's "California Gurls":
Klass.
Here's 31 seconds of the vid: