I got this off the U fly mike website for what its worth...

QC-15: Bose just introduced a new QC-series, the QC-15. It appears the QC-15 is totally compatible with any UFM, past or present, but we have not physically inspected one ourselves to confirm that information. As soon as we have inspected the new headphones, we will post the results in this section.

This was posted in the news section of the uflymike.com website