I wouldn't expect to see a final well thought-out report from NTSB on this complex accident for some time. However,as quite often happens in the case of AAIB, there are some appropiate actions that can be recommended quite early on ( in the case of the Hatton Cross 777 there was some revised shutdown proceedures following a crash). In this case I would imagine that FAA should be asked to study the habits of relatively large and high flying migrating birds and methods of detecting them.
Keith