That's great news, Darren. I'm a long time user of PageFour and Smart-Edit. Of course I use Scrivener as well but always preferred the smaller footprint and easy use of PageFour. Especially the native RTF format was what kept me coming back to PF again and again.
I'm excited about this new tool, and download the BETA version right away. Just learned about it today, when I did my periodical update check on your website.