I'm wondering about this question for some time now - what will happen to all those still open tickets in already finished milestones? They look abandoned to me, they should be either closed if they are already fixed, or moved to 1.next or closest next milestone.

For example this one: 

http://bugs.jquery.com/query?status=reopened&status=assigned&status=new&status=open&status=pending&group=status&milestone=1.4

Or even this one:

http://bugs.jquery.com/query?status=reopened&status=assigned&status=new&status=open&status=pending&group=status&milestone=1.5.1