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 beta1, beta2 fixes some issues with generic Drag and Drop support, adds preserve on refresh, extended client details 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