I think the key things left to do for 2.0 are 'enablers' so that we can add new functionality as easily as possible.
And I'm hoping we can build AJAX features on top of 2.0.
The 2 key things I want to get in are Contexts (which I'm working on now, so will hopefully be able to checkin and explain fairly soon) and the Extensions Market place (which I havnt started).
Are there any other enablers or 'structural changes' anyone would like to get in?
Cheers,
Simon