For the longest time, Ubuntu Unity users have wanted a bit more leverage from the Unity Launcher. As it stands, it's a means to launch applications and get to the Unity Dash. But with the creation of a new tool, Drawers, you can easily organize related items (files, applications, websites, folders, etc.) using "mini dashes" and "quick lists" -- similar to the Stacks feature in OS X. Drawers allows you to organize files together onto the Launcher and even create a Dash-like app menu for quick access to your applications.
For now, the Linux kernel available is 3.13.x, which is the same from Ubuntu 14.04 LTS. The system is basically identical with the previous one, even if there are some changes that have been implemented already.
“Our Trusty kernel has been pocket copied to seed Utopic. We have opened the ubuntu-utopic kernel tree. The master-next branch is currently tracking the v3.15-rc3 kernel. We likely won't upload a v3.15 based kernel until a few more -rc releases come out,” said Canonical’s Joseph Salisbury in the mailing list.
Xubuntu 14.04 LTS Trusty Tahr is an official derivative of Ubuntu 14.04 LTS, released with many improvement and updates. Come with LTS (Long Term Support) version Xubuntu 14.04 will be supported by xubuntu team and developer for 3 years. Without adding tons of new features, Xubuntu focuses on stability, simple, light and fully customizable.
Xubuntu 14.04 LTS Trusty Tahr uses the Xfce desktop environment instead of Unity 7, so it works very well as a lightweight alternative to regular ubuntu desktop. On this release Xubuntu developers have introduced the new Whiskermenu a more modern menu with the ability to easily launch your favorite applications, as well as have a useful search bar and various customizations. You can also find the new Xfwm4 4.11 which includes support for Sync VBlank, Xfdesktop 4.11 and other updates.
That means that if you use Ubuntu 12.10, you should upgrade to Ubuntu 13.10 (Ubuntu 13.04 has already reached end of life) and then (recommended) to 14.04. That's because after May 16 2014, "Ubuntu Security Notices will no longer include information or updated packages for Ubuntu 12.10".
It's also important to mention that PPA maintainers will no longer be able to upload packages for Ubuntu 12.10 after that date.
Everyone knows that Ubuntu is not one of the most customizable operating systems, which is one of the problems that often come up in the Linux community. This is where the Ubuntu Tweak software will really help its users make head or tails of the Ubuntu Linux distro in a way that very few applications can.
The idea was audacious: Combine Android, the most popular mobile version of Linux, with Ubuntu, the leading Linux desktop operating system, on a single smartphone that swapped between the two depending on whether the device was docked. Alas, Ubuntu for Android seems to have moved off the active roster as Canonical focuses on its own Ubuntu Touch project, and a new exchange on a Ubuntu project-tracking website seems to suggest Ubuntu for Android may be dead. (See update below.)