Are questions allowed on SO/SF/SU if they're strongly programming/sysadmin/computer-related but ask about the future? For example, every few days, someone asks a question on Stack Overflow about closures in Java 7; the most recent one I've seen, and the inspiration for this post, is here. I haven't been tracking Java 7 too closely, but I don't think the official spec for the behavior of closures in the as-yet-unreleased version has been published. Some of the earlier questions on the topic were asked indisputably before the information was available.
On the one hand, the SO-family sites are designed to provide objective answers, and it's just plain impossible to definitively answer "how does X work" when X doesn't exist yet. On the other hand, questions are designed to stick around for a long time and be edited to reflect changes in technology rather than grow stale and wrong over the years.
This topic has been touched upon in the feature request New close reason: "Question asks to predict the future", but despite a medium level of support there, no solid conclusion was reached.