Here's a list of the most noteworthy things in the RAP 3.1 M2 milestone build which is available for download since October 02, 2015.
In this milestone we added support for right-to-left orientation. Currently, the implementation is done for Shell, Button, (C)Combo, Composite, ScrolledComposite, Group, Slider, Tree, Table, ProgressBar, Spinner, Menu and TabFolder. Like in SWT, the coordinate system of an RTL Composite is mirrored horizontally (the [ 0, 0 ] point is on top-right corner). This is a work in progress. We will extend the right-to-left support for other widgets in the next milestones.
This list shows all bugs that have been fixed for this milestone build.
The above features are just the ones that are new since the last milestone build. Summaries for earlier builds:
To assist you with the migration from RAP 2.x (or 1.x) to 3.0, we provide a migration guide.