I don't think the whole Microsoft conference has the same amount of excitement around it, as we know very little about it, and what we do know, isn't overly exciting...
Nintendo's conference will be exciting for reasons already mentioned. Sony's will be because it'll be interesting to see what they do about the Vita/Move. Valve's will be because of their new gaming console which is rumoured. And Microsoft's? Kinect? I don't know...