Ubuntu 14.04 provides improved performance, usability and security for a large number of scenarios. This includes cloud deployments, where Ubuntu is already the preferred operating system for many users. You can learn more about Ubuntu 14.04 new features in the release notes announcement.
Over time, we will be making Ubuntu 14.04 the default operating system for our virtual machines and other cloud offerings. Currently the best way to enjoy this new version is to head over to the VMDepot website or use our own Azure Launchpad to launch your favorite apps on Microsoft Azure with one click.