According to Tesla's blog, the results are in and "...This can be confirmed with NHTSA...":
"Second, NHTSA has not opened any investigation nor has it even started a “preliminary evaluation,” which is the lowest form of formal investigatory work that it does. On April 20th, as part of what it has told us it considers “routine screening,” NHTSA informally asked us to provide information about our suspensions. On April 30th, we provided all relevant information to NHTSA. NHTSA has since told us that we have cooperated fully and that no further information is needed. Neither before nor after this information was provided has NHTSA identified any safety issue with Tesla’s suspensions..."