Princess Martha retains her princess title, but will step back from Royal duties, she will not use her Princess title or mention the Royal Family in any of their commercial endeavours or social media.
Her husband-to-be will not be given a title.
It seems a very dignified and appropriate agreement from all the parties involved.
Maybe a similar agreement for the UK royals could bring back some semblance of decorum to the train wreck that it has become, with the RF burying their head and hoping it will all go away, and PH and MM promoting their royal connections and titles for financial gain.