Summary of the new process for appealing PIAs which have been vetoed

I haven't been following this stuff closely and I want to get up to date.

Is there a good summary as to how they affect the family home?

For example, a PIA can be imposed on a lender. But can the lender just simply get around it by seeking an order for possession?

Who pays for the appeals of the PIAs?
What are the guidelines for the Judges in these cases?

Brendan