You may already test the – yet unstable – next version of elementary OS. Loki can be installed on top of Ubuntu 16.04 using a PPA.
Check out elementary OS 0.4 Loki running on top of Ubuntu 16.04 beta in a 2 minute video.
AppCenter is the application center to be feature in elementary OS Loki. It supports the basic function in an elementary style.
The latest maintenance release of elementary OS Freya is out now with lots of bug fixes and some really neat new features.
Pantheon Mail is going to be the successor of Geary email client as the open source company behind it has been ceased.
Freya 0.3.1 brings around 200 bugfixes and tons of new features. It is based on the latest Hardware Enablement stack from Ubuntu 14.04.3.
elementaryPlus is an amazing addition to the default elementary OS icon theme. It adds office suite icons, third party app icons and indicator icons as well.
A new version of Elementary Tweaks has been released. It has a new maintainer and is now available from a new PPA. Click for installation instructions.
Freya Update 1 is bringing some nice new features like the new “Recent” view in Files, a new Language & Region Switchboard plug and a refined battery indicator.