Here the response I received from Bart Chilton when I emailed him regarding this video:

" The levels still have to be determined, but we are required to implement within 180 days. We need to propose the rule for public comment and then make a final determination. I haven't personally decided on what the most appropriate level. I tend to think that no trader should have more than 10% of open interest. The idea of 1500 contracts may also make sense, but I still want to be open-minded during this process.

Best,

B"

The likelihood of positions limits on PM is improving; 6 more months....