Here are the 2016 Guidelines. For those keeping track at home:
February 2015, Updated Guidelines replacing the 1979 Guidelines (No Longer in Effect)
June 2016, Federal Regulations released (Became Binding on December 12)
December 2016, Updated Guidelines replacing the February 2015 Guidelines
What this means:
25 USC 1901 et seq (ICWA) has not changed in 1978, and provides the minimum federal standards for Indian families. State ICWA laws (and corresponding court rules) that provide higher standards still apply. The federal Regulations are now binding and are like the federal law. The December 2016 Guidelines are now in effect and are non-binding interpretation of the Regulations (given the way they are drafted).