I've started looking at the addon manager, as you might have noticed :)
Most likely I will do some major changes - I have only now started
looking at the code after getting it to compile, so I am not entirely
sure yet. E.g. I will try to move most of the threading inside the addon
manager (or so), not into the menus where some of it currently is. But I
have to understand the code a bit more.
But main point is that I will likely change code all over the place :)
Are you currently actively working on the addon manager? If so we have
to commit more often in order to avoid too many clashes between us.