I'm pleased to announce that Marked2 now works with iThoughtsX on the Mac to enable 'Live Outline Preview'.
The way it works?
iThoughtsX will embed a Markdown preview of each map into its corresponding ITMZ file on disk. Marked2 will pull out the Markdown and format it up into 'proper document' (headers, bullet points, links, text etc.) Each time the map is modified and written back to the ITMZ file, Marked2 sees the change and updates automatically.