The current version is unlikely to see any major changes. The next version is well underway but will be a fairly significant departure from the current version. In short it will be balanced more toward and outliner UI as opposed to the current plain text editor UI. I will offer some sort of upgrade pricing and import, but if yes if the current FoldingText isn’t already an easy fit into your workflow you might want to wait a bit for the next version before buying in.
Jesse