Yes, I don't think it's likely we'll see a unified "roadmap", as there are many different development groups working to add completely different features to Hive (opinion processing, games, social media features, etc).
I'll be making a post soon about the work BlockTrades has been doing.
And I'll also be making posts about plans for future work by BlockTrades as well. I've been holding off until we got finished with our current work, as I'll need to write several posts just to set the stage for the new capabilities I want to add to the Hive network.
Your previous suggestions could be good starting points for showing someone what's going on, but many of the posts in HiveDevs are about ongoing work as well as planned features. I created the Hive Improvements community to be a place where users could share ideas for how to improve the network, but it's also not an exact fit either, because it's about ideas more than concrete plans. But both of those could be good starting points.
There's also a group working on a new Hive whitepaper, but that's more of a general "What is Hive" instead of being a roadmap for new features.