Available since yesterday is live OS Tails 2.4 RC1, a live operating system on a CD that runs on every computer and leaves no traces either on the machine or on the internet.
This particular operating Tails used by former CIA agent Edward Snowden to stay hidden online. Since yesterday the Tails 2.4 RC1 version is available for testing by those users who wish and incorporates some important new features and changes, among which we can mention the upgrade to the latest Tor Browser 6.0 web browser, all the improvements of icedove an email and news suite.
The new version also contains many other small but useful enhancements, such as firewall and kernel hardening, and support for languages other than English. You can see the changelog of the new version from here.
Download it from its official website here.