by Richard Oelmann.
And if you cant wait that long, there's a proof of concept backport of the 2.6 assign to Moodle 2.5 here
Note: I am saying this is a proof of concept only simply because I cannot guarantee to maintain the github repository with all the updates that will go into assign for 2.6 as it is developed I will do my best to update it periodically, but wont be able to keep up with the rate of change that often occurs in the development process. That said, once the changes to the course, lang and lib folders in the github repository are in place, you should be able to replace the most current mod/assign folder anyway (subject to further changes!)