While the "zero-day" claims by Exodus Intelligence may capture the attention of the news media, it is significant that TAILS version 1.1 was released yesterday.
After almost 5 years in existence and 35 0.x releases, earlier this year TAILS V1.0 was released.
Yesterdays V1.1 release has TAILS upgraded to using Debian V7 (wheezy) as its base, using LibreOffice instead of OpenOffice, UEFI boot support (which should make TAILS boot on modern hardware and Mac computers) and replacing the Windows XP camouflage with a Windows 8 camouflage.
For the full release notes...
https://tails.boum.org/news/version_1.1/index.en.htmlcheers, Ian.