2.0 version of Flow will bring the possibility to use Polymer 3, npm and JavaScript Modules
instead of Polymer 2, Bower and HTML Imports.
Among other fixes since alpha5, beta1 fixes many issues when running in a Windows environment, Basic level generic Drag and Drop support and bug fixes.
Flow 2.0 requires that in addition to Java 8 and Maven you have node.js + npm installed.
To learn about the new functionality by example see BeverageBuddy 2.0