I've made this suggestion before and I think others have mentioned it too, but I don't think it's in the roadmap (maybe it's in there as a subsection of another feature)
I would LOVE if cintanotes displayed the number of notes in brackets after a tag, and when a tag was selected, showed what other tags intersected with this tag (in the same way as evernote)

Alot of people would certainly see this as interface clutter but I would find this useful. Maybe it could be an optional feature that is turned off by default?