A change that was talked about previously was reducing the curation window further from 15 minutes. Hard Fork 20 reduced the window from 30 minutes to 15 minutes.
The current proposed change in Hard Fork 21 will reduce this window to 1 minute. The idea is to minimize the frustration of voting on a comment or post and it is too early.
If the Hard Fork is approved as is, the new curation reverse auction window will be 1 minute.