Meet Game X. It's an online game. A rather popular online game, in fact. That doesn't really matter, though. Whenever the game has to be maintained, this happens:
This is the natural course of online games. It goes down, so that something can be done to it. Nothing wrong with that. We can't play it during the downtime, but questions can still be asked about it, because we have played the game, and remember how it works. It's a reasonable assumption that mechanics will stay the same.
As time goes on, Game X continues to be played. The developers have announced a content update for the game! Celebration ensues! More stuff to do! More things to kill! They haven't given us a release date for this content, but given us a sneak peek at what they plan to add. Our "chart" now looks like this:
(Yes, I'm using Excel. Sue me.)
At this point, questions regarding the Content Update would be off-topic here. We have nothing to play, nothing to go on, except what the developers tell us. Anything about the base Game X would sill be something we'd help with, though.
A bit more time passes, and the developers announce a beta! More celebrations, yadda yadda. They will keep the regular game going, and the Content Update becomes a separate instance:
Notwithstanding NDAs or other legalese, we would allow questions about both instances. Both Game X, and Content Update. Since both can be played, there is no speculation going on here.
Alas, the beta has now ended, and much dismay was had. But rejoice! We now have a release date for the Content Update! It's not quite ready yet, but it will be soon.
At this point, we'd still continue to accept questions about Game X. Questions about Content Update, though, become somewhat sticky. We had a body of work to reference. With Content Update, there's the implication that changes will be made in between the time the beta ends, and when it will be released. If there wasn't, there would be no need not to release as soon as the beta concludes. What those changes are, nobody knows. Our only sources at this point are the developers yet again. We can no longer verify the accuracy of what Content Update contains.
This is the dilemma we are currently facing with Reaper of Souls, the Diablo 3 expansion.
This isn't a scenario we've really run into before; betas usually run right up to the release date, and the amount of downtime between beta end and release is usually small enough to render the chances of asking speculative questions rather small. Trust Blizzard to give us a completely new scenario.
I think there's merit in deciding how we want to handle this.
How do we handle questions about currently unplayable content that we used to be able to play? Unreleased content that carries the implication of change between what we could play, but no longer can.