Okay, so we're currently holding our breath while the developer preview of iPhone OS 4 installs on our 3GS -- a process that seems to be, uh, not going so well, but we wanted to share these quick shots we took from the simulator in the meantime. The dock is now 3D, like the one in Snow Leopard and on the iPad, multitasking works just like you'd expect -- you can swipe left and right to see more open apps -- and the Game Center app is present, although not functional. There's also Events and Faces in the Photos app, which you'd expect after the iPad version got them.
Source:
http://www.engadget.com/2010/04/08/iphone-os-4-hands-on/
