Great to have it confirmed. Lovely they will be living at Frogmore, even if cottage and not main house. The estate has played a special role for them.
Even if the planning permission was only new I highly doubt they waited till now to tell the residents. They didn't kick people into the street just before Christmas
Unless they bought a new place it was going to be a reality they woukd have to move someone as the properties are all being used in some form. I find it funny people are upset employees are being rehoused but were all for the Gloucesters having to relocate from their long time home. Same thing happened with Amner, it was leased. The queen actually ended the lease early on the tennant so the work could be done.
Their rented place makes sense. They likely knew the planning and work would take time. Since unlike William and Kate they would not have alternative housing when the baby came (Wales until early September and Buckleberry) the rental gave them some where to be. They can stay there until work is done. Likely something was worked out with their agreement.
The home makes sense. Close to London to be their main home. They can gave a small London base if needed like Anne, Andrew and Edward do.
As for Philip he is often at Windsor. And he isn't reason enough for them to live at Sandringham. This is their long term home, even after he passes. This base suits their life so much better. Like they do now, they will visit Sandringham at Christmas and other times. Possible when Charles is king, they will use something like wood farm for their privacy at holidays.
Nice touch that the cottage was Queen Mary's home. Meghan wore Mary's diamond bandeau at the wedding. I know not reason for the house but still a nice link.