from what i've read, this fall will be the 4S. (bigger screen, better camera) and the 5 will actually wait til 2012 cause of the integration of the LTE chip and the fact that it wasn't ready for this year's release.
Apple announced at WWDC that iOS5 will be released in the fall. iOS5 will not be released before the next iPhone release, that goes without saying. More than likely the next iPhone release will be sometime in the fall.
I can def wait till the Iphone 5 comes out. I will probably due for an upgrade by the time it drops....either the 4S or 5 is good for me. ****, i'm still in love with my 3GS!
Apple does not leak info out (at least on purpose) about their devices. They like to build anticipation and unveil it all at their presentations. It's easily suspected that the next iPhone will be out this fall when iOS 5 comes out. Most likely September. Just my guesstimate.