They released a TSB on this today for all 2016 Explorer built up through 1/31/16.
TSB 16-0021 BODY CREAK/POP NOISE OVER BUMPS - RIGHT FRONT SUBFRAME BOLT AREA - BUILT ON OR BEFORE 1/31/2016
Publication Date: February 23, 2016
FORD: 2016 Explorer
ISSUE:
Some 2016 Explorer vehicles built on or before 1/31/2016 may exhibit a pop or creak noise from the right front mounting bolt of the front subframe. This condition may be due to a mispositioned weld between the barrel nut and the subframe mounting bracket
My summation of the fix: The have to remove the right front wheel and splash shield. Then they mark lines on the sheet metal on the inner fender and using a cutting wheel tool make a flap that allows access to the barrel nut they are referring to. They weld the nut to subframe, fold the flap back up, weld that, apply some anti rust stuff and put it back together.
Estimated time to fix - 1.3 hrs.