Will Acquia backport new functionality from newer releases of Drupal into older supported releases?
We have no plans to do so. Such a move would be inconsistent with the long-established Drupal Project development philosophy and culture. Our practice and strong preference is to align with, seek leverage from, and provide leverage to the Drupal community. Back-porting new features into an older version without the overwhelming support of the Drupal community would be tantamount to forking Drupal, with all the associated redundant effort and diffusion of scarce resources. Acquia opposes the forking of Drupal, so no back-porting is planned.