This release adds support for holes in EllipsoidSurfaceRegions, both for analysis as well as CZML generation.
A polygon with holes, displayed in Cesium using CZML
We've also added support for a number of new CZML features that have recently been added to Cesium and the CZML spec, such as model articulations and a more fine-grained CZML delete property.
Finally, in the Communications Library, we've added many new antenna gain patterns, as part of our continuing efforts to achieve feature parity between the STK Components libraries and STK Desktop.
For a complete listing of bug fixes and improvements made in this release, check the What's New topic in the documentation (.NET / Java).