What Cursed said :)
The next Act (Act Three) is... well, shit's really going to hit the fan. It's going to close out most, if not all, of the Act Two content and so I really need to be sure that all the side content for Act Two is complete before moving on.
Believe me, I'd love to get on with the main story. I have so many plans! I'm trying to get there as fast as possible, but no timetable I'm afraid.