I got the priority email this morning as well. The priority waitlist I believe is the same as the "high" waitlist and if previous years can be used as a guide it includes the top 130-150 people. It seems like in the past they have numerically ranked this list and made offers until the class was full, sometimes making it as far the first 70 or so applicants.
In the past there has also been a medium and low waitlist, both of which mean a slim to none chance of getting an offer.
I know they sent out two very different waitlist letters to the people in my interview group, some were told that helpful information would follow and others were told flat out that they would not be ranked so maybe they decide who is priority and who isn't when they initially waitlist you.
Anyway this is all just me guessing based on what I have observed and what has happened in the past, it may be different this year since Mr Perez is new.
In the past there has also been a medium and low waitlist, both of which mean a slim to none chance of getting an offer.
I know they sent out two very different waitlist letters to the people in my interview group, some were told that helpful information would follow and others were told flat out that they would not be ranked so maybe they decide who is priority and who isn't when they initially waitlist you.
Anyway this is all just me guessing based on what I have observed and what has happened in the past, it may be different this year since Mr Perez is new.