As of Unity 3 rc1, the Unity splash screen on iPhone (Basic) isn't rotated properly on startup. In my case, it always appears Landscape Left even though my game itself handles both landscape orientations.
I've heard of apps getting rejected for this splash screen behavior (see this forum thread) but it's not clear if this has happened recently. There is a workaround involving a hand-edit to the XCode project's plist described in that thread for Unity iPhone 1.7, but it's inconvenient and it actually messed up my game when I tried it- before I investigate it with Unity 3 I'd like to know if this is actually an issue. (If it was, I would have thought that Unity Technologies would have built it into Unity by now!)
Thanks for the reminder! I posted in the forums that it worked in rc1, forgot to post it here.
– Bampf