Read it on heise.de (german only - sorry):
The Fairphone 2 will be designed and built by contract manufacturer Hi-P. Hi-P is located in Singapore. Some years ago, they acquired a Motorola design center. So it’s possible that FP2 will be designed by ex-Motorola engineers.
Edit: Sorry once again. I should have had a look into Fairphone’s blog first; there’s that information, too.