From what I read that is the case as long as you continue to submit applications every 24 months. So as long as you are constantly submitting forms, no new prints need to be sent. If there is a 24 month lull you will need to submit them for everyone again. .... this is what I gathered from the 41p thread going on over on arfcom
That's right. Just want it to be clear that you don't have to submit prints and pics UNLESS you are submitting a form and it's been more than 2 years since your last one. From what I read, you don't have to do anything if you are simply adding someone to your trust or your trust sits as-is with the weapons it has in it. It seems some people thought you would just have to submit prints and pics every 2 years even if you didn't buy anything.
Also, I'm sure the first thing you buy after this goes into effect will have to include the prints and pics from the responsible persons even if your last pre-41p purchase was less than 24 months prior.