It looks like an attempt to remove the CLEO certification by the NFATCA which began in 2009 has backfired and now the ATF is wanting a modified CLEO signature, NICS check, fingerprint cards, photograph, certificate of citizenship for every responsible party of a fictitious entity. You can obtain a copy of the proposed rule here
While ATF already has a definition of responsible party for dealers, they are proposing the following for fictitious entities:
Depending on the context, the term “responsible party” includes any individual, including any grantor, trustee, beneficiary, partner, member, officer, director, board member, owner, shareholder, or manager, who possesses, directly or indirectly, the power or authority under any trust instrument, contract, agreement, article, certificate, bylaw, or instrument, or under state law, to receive, possess, ship, transport, deliver, transfer, or otherwise dispose of a firearm for, or on behalf of the entity.