Hi HN - Jon Skinner here, I made Sublime Text and Sublime Merge, alongside the rest of the Sublime HQ programming team - Will, Dylan and Benjamin. Let me know if you have any questions! Edit: there's also the announcement blog post, at https://www.sublimetext.com/blog/articles/sublime-merge
Totally appreciate your ST work Jon (main driver for 6+ years, used Vim before for 15+ years). Will definitely try Merge. Does it offer any integration with Sublime itself (e.g. if someone has a license for both)?
Right now, Sublime Merge will pickup installed Sublime Text packages (e.g., for syntax highlighting), and will also find Sublime Text when you choose Open in Editor from within Merge (this can be customised to something else though, of course).