None of the existing categories would match this. I recently posted a general discussion related to forum itself and not FileMaker. I could not fit it in in any categories as well, although a lot of forums do provide some "General discussion" section
I am not sure if users actually use categories that much, I just read a last dozen of discussions when I visit.
I think you are on the right track with tags, but this will be not as prominent as a separate category.
I didn't see it at the time I posted this. Now, on the Discussion layout, on the right hand side, under "Other Discussions" is "Product Announcements". I'm not sure if I overlooked this or if it wasn't there a couple of weeks ago.
You are right, I haven't seen it before and then it appeared. I also noticed it sometime ago. Someone is listening.