An interesting picture has just been posted earlier today by TPAMagazine on Twitter, who are currently taking a tour of Universal Studios Hollywood. The picture is of the "daily shooting schedule" board which is listing (as of January 9th 2011), Desperate Housewives, Parenthood and... Jurassic Park 4. Yes... I'm confused too. Here is the photograph.
Oh and there is one more photograph which is apparently the War of the Worlds stage being shot on, suggesting it could be JPIV. We'll just have to wait and see, and I will keep you all updated.