Questions about the game's content (like "Is there a limit to how many potions I can carry?") are almost certainly going to be fine. Games in beta are games in their own right too. They might not be answerable yet, but honest questions that will be answerable in time and remain useful (even if only niche-useful) over time are OK, and doppelgreener's answer covers some excellent details on that point. (The only thing to watch out for here is “camping” a question: asking a question pre-emptively that one knows can't be answered yet, just to be the one to get the rep for it later when the game is released and starts getting lots of attention. I don't think that's going to happen much, but it's something to be aware of and, if the temptation is felt, to avoid.)
Asking questions about the game's state of development (like "Who is the lead developer" or "Is it out yet? What about now?") may get closed as too localised (in time) if it would be meaningless to host long-term. (“Too localized” isn't a prewritten close reason anymore, but it's still a reason to close a question.) This isn't a hard-and-fast rule: it's possible that some types of questions about a game's state of development will get a pass, but it's not something we can give a blanket “yes” or “no” to ahead of time. We can only say for sure after seeing the specific question, so the best way to find out is to try it on the live site and see the response.
So TL;DR it depends on the question.
Update: Now that you've asked the question, it falls squarely into the "Is it out yet? What about now?" type of question that we don't handle. Just like Will a 5th edition of Dungeons & Dragons be released?, the question becomes meaningless to ask at the exact moment that it becomes answerable, because it's just requesting that people share news. (Such questions are also magnets for speculation, which is secondary to the asking-for-news issue but still causes significant problems.)