A brief overview of new features:
- Single popover for suggested changes and comments in collaborative editing;
- Unified user color;
- Content control settings for creating forms and templates;
- Automatic list numbering/marking;
- Bookmarks and hyperlinks in text documents;
- New page presets;
- New Layout tab in the spreadsheet editor;
and much more.
You can find additional info in the ONLYOFFICE blog post.