The Technical Guideline Development Committee (TGDC) released new Voluntary Voting System Guidelines (VVSG) back in September. The guidelines are currently being reviewed by the Election Assistance Commission (EAC) and if approved will be submitted for public comment. VVSG 2.0 contains language requiring voting systems be 'software independent' and allow for 'efficient audits' which is great improvement from previous guidelines.
Read more: VVSG 2.0
More information on VVSG at EAC's website.