Java Edition 1.9.1

1.9.1^[1] is an update for Minecraft which is planned to be released two weeks from March 9, 2016. 1.9.1 is compatible with 1.9 servers.

Additions

Added elytra sound effects
Armor attribute generic.armorToughness
- Makes stronger armor take less armor point reduction from attacks^[2]
New option enableWeakAttacks in options.txt
- Setting to false will disable weapon cooldown.

Session ID is now no longer printed by the game to the log files or to the launcher.^[3]
Entity selector c (count) now sorts on proximity using true coordinates, not coordinates snapped to the grid.^[4]
You can no longer attack unless the weapon recharge bar is filled 70% or more.
Loot tables now also work in dispensers and droppers
- Dispensers with arrows in jungle temples now use loot tables.
Hoppers can now push and pull items to and from blocked chests.
Increased limit per tick for scheduled tile ticks from 1,000 to 65,536.
Improved AI.^[verify]

MC-7961 – Hopper can't fill or empty a chest if the chest is blocked from opening.
MC-56162 – Setting /worldborder damage amount 0 doesn't work.
MC-95352 – Spatial target arguments c, dx, dy, dz behave unexpectedly and inconsistently.

MC-90257 – A chain of command blocks may takes more than 1 tick to traverse.
MC-96219 – Block duplication bug with pistons (ghost blocks).
MC-96927 – Selector c Targeting Inaccurate Entity Position
MC-98327 – Elytra texture transparency issues.
MC-98461 – Several languages (at least Frisian, Talossan, Ripuarian, Lojban, and LOLCAT) are not selectable, "Eesti (Eesti)" is listed as "Inglise (US)"
MC-98587 – Command block logic sometimes fails arbitrarily
MC-99060 – Elytra glowing effect is always black.

Fixed game engine adding non-existent entities (failed mob spawns, etc.) to its internal lists, increasing instability.^[5]