Is this verified? There definitely was some team working on the iPad version of iphone OS and that team did know about the 4.0
Nothing verified, but its what makes sense in software development and the secret nature of Apple development. Sure, of course the iPad development team knew about 4.0. But, why introduce an unstable OS for a new product. It was better to take 3.0, call it 3.2 and introduce all the iPad related features.
4.0 is at the end of feature development and now they are fixing, polishing and testing. Again, why add a new platform into the end of a development cycle. Its ALWAYS a bad idea, once you hit a feature freeze you hit a feature freeze. Then, after 4.0 is released they will need a few rounds of last minute fixes ... and its off to polishing 4.0 for the iPad.