What does that mean for PCL and ROS?
Nothing basically, we can continue to release the current version of openni2 for Xtion and other non-Kinect primesense sensors and I have found libfreenect to work far better than openni for Kinect v1. As the PCL developer's mailing list put it, there are many (probably thousands) of Xtion users in the perception community and that's a plenty large enough group of people to support maintenance of the project going forward.
as long as the license for openni's existing open-source code does not get changed.
AFAIK, there is nothing in their license (Apache 2.0) which they could use to prevent us from continuing to distribute or fork the existing code on Github.