Blender Foundation has been accepted for 'Google Summer of Code' this year, and one of the potential student projects is finishing PTex integration (PTex integration was started during a previous year but wasn't developed to a level where it could be moved into a release branch).
See the Blender GSoC ideas page
and here is the page that lists the state of the previous integration work and the todos
if you know any skilled college programming students who might be interested in working on this, please do encourage them to apply :)
Any interested students can contact me with any questions, or you can ask questions on the blender irc channel #blendercoders on irc.freenode.net
or the bf-committers mailing list or you can contact the mentor for the project - sergey AT blender DOT org.
Thanks for your time and consideration,