You can now block attacks while your shield is in the sheathed position. Previously, Warriors, Shamans and Paladins were vulnerable while using instant-cast abilities that caused their shield to momentarily appear on their back.
When using the dressing room in shapeshift form, armor and weapons will be shown on the druid's humanoid form, not on the druid's shapeshift form, where no change will be present. (This also counts for all shape-changing effects)
Entering Shadowform gives a new action bar (like stealth).
Inner Focus now has a new graphic blue aura that surrounds the Priest for a short time.
Mass Dispel now has a new graphic when cast. The same holy symbol (as seen also on Prayer of Mending) is still present, but the graphic has been changed to a darkish-blue pulse that emanates from the center of the cast.
Pain Suppression also has a new blue aura surrounding the priest, instead of the white ring with shields.
New epic helms have been added to G'eras for 50 badges of justice each. 
Netherstrike Belt has been changed to 9 Stamina (-9 stamina); 15 Intellect (+3 intellect); Improved Spell Critical strike raiting by 14 (-6 spell crit); Improves Damage and Healing by 28 (+3 spell damage)
While fishing has improved in the two documented cases, the other change is that the bobber disappears as soon as the timer is up. This mostly has an effect of fish biting with 1/2 second remaining require faster reflexes to catch than before.
Mr. Pinchy's Blessing, the flask effect gained randomly when using Mr. Pinchy, now only provides 500 HP. Still counts as a flask (persists through death, counts as Battle and Guardian Elixir).
Female draenei have now a new stand and jump (see the cloak) animation.
The graphical Elekk bugs have been fixed: the hole in the left front leg and the sitting spot of the character.
Velen, the draenei racial leader, now has a unique set of quotes.
Battle elixirs: Elixir of Major Shadow Power, Fel Strength Elixir, Elixir of Major Agility, Elixir of Major Fire Power, Elixir of Major Frost Power, Elixir of Mastery, Elixir of Healing Power, Elixir of Major Strength, Adept's Elixir, Onslaught Elixir
Guardian elixirs: Elixir of Major Defense, Elixir of Draenic Wisdom, Earthen Elixir, Elixir of Major Fortitude, Elixir of Ironskin, Elixir of Major Mageblood, Major Troll's Blood Potion
There are reports that items can disappear when collecting them from the mailbox.
This has since been hotfixed. However, items taken out of the mailbox will not stack with identical items in your bags. This is a reversal of a change in this patch (see the User Interface section on this page.)
Pets sometimes die when you mount up on Netherwing Ledge while under the Dragonmaw illusion.
Many mobs now appear to "hop" across terrain, especially steep grades.