According to this RadioTimes article, Ricky Gervais recently dropped a slight hint that he might be thinking about doing more with The Office.

My first thought was "Hah!  Good luck getting Tim back!"  My next thought was, sure, it's just the press trying to make something out of nothing again.  But the more I think about it, the more intrigued I am by the thought of a reunion show -- what are they all up to now?  There might be a chance of getting everyone back if it was just a one-time special rather than a new series.  Maybe.