1) Kingdom Halls are now owned by the WTBS and not the local congregation
Not necessarily. There is a clause in congregation corporation bylaws that states that should the corporation evern be dissolved by whatever methods, the KH becomes the property of WTBTS.
2) Mortgages have been canceled, instead of making loan payments to the Society, the local congregations are pledging contributions of roughly the same amount. Congregations that had already paid off their mortgage are expected to pledge an amount roughly equal to what their mortgage would be if they had one. These payments will never end.
This is essentially correct. However, what is being donated on a monthly basis is to be reviewed every May. It might be possible that a congregation deems that the amount is lowered at some point in the future based on their own calculations as to when a loan would have been paid off.
Personally, I see this as a response to an undisclosed legal issue. Likely something related to banking regulations. Possibly a lawsuit somewhere. Possbily something with some other organization and the WTBTS is trying to get a leg up on it. Who knows? I don't. But it has "legal" written all over it.