Tails 2.11 [will] be the last [version] to ship with the I2P anonymizing network software. I2P 0.9.25 is included in Tails 2.11, and it's already a very old version. The decision was made because the Tails team don't have the time to maintain I2P in their distribution.

[...] Two new features have been added in today's Tails 2.11 release, namely a notification to inform users that the upcoming Tails 3.0 Live CD won't start on a very old computer with a 32-bit processor, as well as another notification which will warn you that the I2P software will be removed in the next version, Tails 2.12.

Tails 2.11 also comes with the Tor Browser 6.5.1 anonymous web browser, and includes a bunch of security fixes for the infamous local root privilege escalation (CVE-2017-6074) by disabling the dccp module. Additionally, Linux kernel 4.8.15 was installed to prevent the GNOME desktop environment from freezing on Intel GM965/GL960 GPUs.

[It also] addresses an issue with the Tor Browser that did not display the offline warning when attempting to open the local documentation of Tails, as well as a rare problem that caused automatic upgrades to be applied incorrectly.