Do they allow threads there that aren't part of the asset store?
If they do, I could just cross post any news and version updates Nate posts in the changelog and forum, and link to here. Nothing else. That shouldn't be a problem. That is if they allow it there.
Asset store topics are a mess for discussion. Everyone posts random bugs and comments in one super-long thread and it's hard to follow anything. I don't think it's a good idea to keep a discussion thread there. And in that case, it'd be weird to keep a changelog/news thread in the Unity forums.
But I do agree that Spine could stand to have some kind of presence in the Unity forums somehow, just so people know.