Checking the questions tagged with the [upcoming-games] tag, they all seem highly speculative, argumentive or too localized.
What do we want with this tag, and do we even want this tag in the first place?
Yes, I agree that speculation about upcoming games is really bad.
But I think it could be useful during private beta's, where players who made it in can answer questions that will help users prepare for the upcoming launch (as with WoW Cataclysm).
Also regarding Rock Band 3, I will have to make a choice between the different types of guitars, so I want to know which to choose BEFORE the launch, so I could get it on launch day.
So while I agree speculation is bad, I do see a use case for it. However, the questions as linked in upcoming-games mostly suck as a question anyway...