iMovie icon on iPhone it true 3G

I was looking in the at the product Juice Pack Case (rechargeable Battery) for the iPhone 2nd Gen and I saw an interesting icon on the home screen of the iPhone in the ad. The phone had an iMovie icon on its home screen in the dock.
I just want to know if anyone knows what what this is. Here is a link:
http://store.apple.com/us/product/TV943VC/A?fnode=MTY1NDA4Mg&mco=NjM0MTMwMw
Look at the bottom of the home screen - second icon from the right.
Powerbook G4 15/iPhone 3G Mac OS X (10.5.7)