Our plan has always been to have a 'config' package that includes traitlets as the lowest level, most stable package. But some of the work you guys want in traitlets suggests that maybe Widgets should ship its own fork of traitlets where that stuff happens.
@minrk I just installed the new IPython 3.0 and tried it out with a custom python module that makes use of threading. What I noticed is that if I create a thread in a cell, the thread does not run until the cell finishes executing. It worked fine in IPython 2.x but doesn't work in IPython 3.0 . What has changed between IPython 2.x and IPython 3.0 with regard to threading?