Watching more WWDC, Session 200 what's new in Cocoa Touch... @ 20.00 he says that latest Xcode doesn't support < iOS 4.3. Is this true? My concern is that there is a huge number or < 4.3 devices out there and I might want to keep a version of Xcode that still supports it. Edit: one of the upgrades/change is NOT using viewWillUnload and viewDidUnload. He says not to use these in 5 but doesn't talk about < 4.3, however the logic suggest not using them.