I'm playing with them right now.

As already said, useful!

Some random suggestions.

The thread view does not work very well with main notes, because after you click the item you find an identical one.

I would remove the referred note from the drafts preview, to make room for the user content; the text should be enough to understand the context and the thread is just one click away.

A long press to edit is too hidden, why not use the single tap? If it's somehow problematic in some areas I would add a full width button "Draft - Edit" at the bottom of the note. This also solves the problem that drafts are not highlighted when scrolling a thread.