The first beta version of the upcoming Ubuntu 16.04 LTS (Xenial Xerus) operating system will be released in a few hours. So the developers have stopped adding new ones characteristics, and are working on optimizing what they added in the new version. 
The upcoming Ubuntu 16.04 LTS distribution will be released with a new kernel (linux-4.4.0-7.22), which is obviously based on the 4.4.2 LTS (Long Term Support) Linux kernel announced by Greg Kroah-Hartman on 17 February 2016.
So the Ubuntu Kernel Team reports in the weekly newsletter that Ubuntu 16.04 LTS kernel packages will be based on Linux Kernel 4.4.2, prompting those who want to test the upcoming beta and report any problems they may encounter.
Let's say that except from kernel 4.4.2, the new Ubuntu 16.04 LTS (Xenial Xerus) has many other important updates, such as the latest version of the office suite LibreOffice 5.1. Also, the GNOME app Software is installed by default.
So we expect Ubuntu 1604 LTS to be a big release and come with the latest software packages like the new Mozilla Firefox 45.0 and Thunderbird 45.0 which will fully support GTK3.
The Xenial Xerus will be officially released at 23 April 2016, but until then, those who are interested can try the Beta version.
