Apple has contacted the component manufacturers for the iPhone and asked them to start delivering materials next month.

With the materials coming in at the beginning of April, they will likely begin production shortly thereafter. This sounds about right if they're going have the iPhone ready for launch by June.

Since they are expecting the components to be shipped by the beginning of next month, it would seem that they have finally decided upon which manufacturers are going to be supplying the components. We'll let you know when we have the full list.

Apple notifies iPhone part makers [via looprumors]