I voted "other" and no roadmaps at all. I might have voted for the high-level HW roadmap, but only now I understand better what it is.

I don't find the idea of an official channel to propose ideas appealing unless there is a real feeling of a dialog with the company. It can't be just a mere suggestion box. This is a bit the feeling I have from Google, for example. You can send them ideas, but they usually behave like a little black box (or maybe white with colorful spots all over).

Now if the channel is full-duplex, then we are talking something else entirely. It's almost having a "wiki roadmap"!...