Here is the department response, from page 198 of the ruling.
The way I interpret that is that if you have a NFA trust now, with trustee, co-trustee and beneficiaries but don't purchase any more NFA devices, they aren't going to expect everyone named in the trust to submit photos, fingerprints etc. for Forms that are pending, or have been approved already. However, if you go and buy a new NFA device on that same trust, everyone on the trust will be subject to the new requirements.
This is correct. So, get everything you can under a trust right now to avoid the requirements. That way, all of those people can possess whatever is in the trust until the 180 day expiration.