We had the same question... I haven't been able to find out what MPs are able to actually do after 12 months that they can't do before.
Finally my PPR email came this morning!!! Completely out of the blue - my medical still hadn't passed as of Friday according to myCIC. Incredibly frustrating that they can't bother to keep things up to date. It causes so much unnecessary stress, and I'm sure more strain on the system since we're all emailling, calling, and contacting our MPs.
(Recap - US Outland applied Jan 30, 2017, SA March 3, 2017, medicals never "passed", PPR Jan. 9, 2018.)