Another item we took care of is improving the experimental support in new ui for application with text direction right to left (sometime referred as RTL support).
As a reminder, you can switch any application to use text direction right to left (instead of left to right) by just adding rtl=true to the url.
Before 4.0.3, you also had to include Bootstrap RTL in a custom header to have sections be responsive.
As of 4.0.3, this is not necessary anymore. When the query param rtl=true is set, we automatically include it for you.
The version we have bundled in the kit is Bootstrap RTL V3.3.4 (The latest available at the time).
Thierry.