White iPhone 4 available in Apple store on Thursday April 28th, 2011
Steve Jobs - "It's not as simple as making something white. There's a lot more that goes into both the material science of it–how it holds up over time… but also in how it all works with the sensors."
Now their has been rumors that Apple wont be releasing a new iPhone 5 this summer like they do every year. And with the late release of the White iPhone 4, its looking more and more like a fact. Maybe Sep? Time will tell.