Doesn't apply to us since we don't use brokers and we don't purchase, but here's my two cents...
I would get a list of their MLO id numbers and a copy of the employing entities policy and procedures, review them, and file in a due diligence file. Then annually I would ask for an updated list of MLO id numbers and a certification of any changes to their P&P. To verify the MLO ids, I would search the consumer database to ensure they are active. If your 3rd parties are non-banks you can do that now. If they are banks you will have to wait until after July to check it.
As far as how the database will work, I would assume it will work the same way it does now, but no one will know until it is actually up and running.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.