I know that you can't ask questions about upcoming releases that are still in development, however, can you ask questions about them when you are not asking for help with them? For instance after certain feature freezes (such as UI freeze etc) can you ask which features made it? Or is this the wrong place to ask?
If it's the sort of question that can be answered and it's otherwise within our scope, it's probably on-topic.
That means it usually boils down to timing. The earlier in a development cycle you ask something, the less likely that is going to be a good question.
There is plenty of water under this bridge though.