Notable changes since beta 2:
- Reintroduced and rewritten the tag builder.
- Reintroduced site name in admin header area.
- Rewritten admin-side layout grid and various UI widgets in Flexbox, which affords better support for RTL languages.
- Many RTL language admin-side improvements.
- Improved layout accessibility for pages, forms, styles panels by moving content-switcher to left-hand column.
- Removed built-in Gzip compression of RSS feed and Atom feed (server compression tools can, and should, handle this task).
- Multi-site bug fixes.
- Minor improvements to public-side theme.
- Various other bug fixes and cosmetic improvements, as reported by beta testers.