Marlon and Shawn Wayans are both back for more and share writing credits. Older brother Keenan Ivory Wayans again directs. Also returning are Anna Faris and Regina Hall (mysteriously returning to life without explanation from the previous film--strange). New faces include Tori Spelling and Kathleen Richardson (both from Beverly Hills: 90210 fame), Tim Curry, and one very funny Chris Elliot. Watch for guest cameos by Howard Stern Show wack pack member Beetlejuice, ex Conan O'Brien sidekick Andy Richter, and (replacing Marlon Brando at the last minute) James Woods.
I saw this movie on the day of release at the first showing and the crowd was rolling in the aisles. The movie is hilarious from beginning to end. It will probably, like the first movie, be criticised for the nature of the humor, but, caveat emptor. I loved it. I won't spoil anything for you by explaining any of the gags.
Bottom line: Very, very funny movie. See it in an audience full of fans ready to laugh their asses off.
For more information on Scary Movie 2, go to this link at Yahoo! Movies, because there doesn't seem to be an official Scary Movie 2 web site yet.