How will the new Power Down cycle effect people already Powering Down?

Power Down cycle is changing

The Power Down cycle is changing from 2 years to 3 months.

Dan has listed these changes here https://steemit.com/steem/@dantheman/steem-economic-changes-update but he does not necessarily mention the changes to the Power Down cycle in the post..

However if you check here https://github.com/steemit/steem/issues/551 he says

Reducing the Steem Power holding period to a minimum of three months.

So maybe I am confused, but how will this effect the people who are already "Powering Down" and the time already spent previously Powering Down?

Will everyone's Power Down cycle reset to 3 months?

Or will the time already spent be considered and factored in automatically when it is changed?

If anyone has any more information on how this will work will you please comment below.. Thanks for taking the time to check out my post!