Thanks a lot for your suggestion and feedback. I absolutely agree with you.
If we're talking about your specific points I can comment them briefly:
1. We plan to introduce a new documentation of developers.
2. There are a lot of changes coming related to our marketplace such as new submission process, plugin testing, new structure, etc. Furthermore, we're going to introduce absolutely new official website in about 2-3 months. I mean not just new web design but also new structure, new content, new "everything"
I'm going to share a detailed vision about our roadmap at nopCommerce Days
on November 8th. It'll also include a couple of huge (!) announcements I don't want to share right now. So please wait =))