DL has announced major changes in Comfort+ which are effective with flights departing on May 16, 2016. Heavy restrictions on free C+ for all, especially top tier Medallions.

Here's a link to the FAQ's on the dl.com website which will explain a lot. Since there's a new fare class (W) and speculation that C+ seating will become a separate cabin (even on domestic), there are also questions about how this will affect pass riders which is why I'm posting this news here.