Calligra 2.8 Words and Author programs add support for having comments in the text, the Sheets spreadsheet program has improved support for pivot tables, and the Kexi visual database creator has support for newer versions of PostgreSQL and it's also now Microsoft Windows compatible.
The Krita painting/drawing program is perhaps most exciting of Calligra 2.8 and features a new high-quality scaling mode for the OpenGL canvas, G'Mic integration, a wraparound painting mode, touch-screen support, and much more. There's also the introduction of Krita Sketch as a version aimed for tablets. A few days ago I was writing about the extensive Krita changes and how it's now using OpenGL 3.0. Krita 2.8 will also be Windows compatible.
For many more details on the Calligra 2.8 changes or to try out the 2.8 Beta that was made available this morning, stop by Calligra.org. The official Calligra 2.8 release is expected before the end of January.