Hello,
from my point of view, the last to sort out for v4.0.0 is packaging (I just sent a dedicated email to decide on that). Personally I have been testing v4.0.0 thoroughly in various cases, no critical issue being on my list at this moment. Also, v4.0 is running for quite some time on voipuser.org (our usual life testing platform).
I propose releasing v4.0.0 next Monday, on March 11, 2013. The second option, if more people prefer it, would be Thursday, March 14, 2013.
Opinions? If anybody has other dates in mine, let us know here.
Cheers, Daniel