Adobe just released Preview 7 of Edge Reflow! There are some really nice improvements in this version. Here are some of the hilights:
New Starter Experience
There are now 11 short tutorial videos (done by Paul Trani) to walk you through each step in creating a responsive design in Reflow.
You can now add forms to your design with the new Form Elements, including buttons, select drop-downs, text inputs, check-boxes and radio buttons.
Reflow now can create links across multiple pages to show navigation.
Insertion & Groups
The team has introduces a more intuitively way to move objects in the layout with the new insertion caret. Also, working with groups (command/ctrl G) and elements within groups is now much easier and more intuitive