The Ubuntu kernel has been updated to the 5.3 based Linux kernel, and our default toolchain has moved to gcc 9.2 with glibc 2.30. Additionally, the Raspberry Pi images now support the new Pi 4 as well as 2 and 3.
Ubuntu Desktop 19.10 introduces GNOME 3.34 the fastest release yet with significant performance improvements delivering a more responsive experience. App organisation is easier with the ability to drag and drop icons into categorised folders and users can select light or dark Yaru theme variants. The Ubuntu Desktop installer also introduces installing to ZFS as a root filesystem as an experimental feature.
Ubuntu Server 19.10 integrates recent innovations from key open infrastructure projects like OpenStack Train, Kubernetes, and Ceph with advanced life-cycle management for multi-cloud and on-prem operations, from bare metal, VMware and OpenStack to every major public cloud.
While you may not be using the default Ubuntu, lots of people are using Ubuntu-based distributions like Mint, so a new Ubuntu release always affects quite a few people far beyond just Ubuntu users.