This update to Final Fantasy Tactics 1.3 brings caster job balance in the early, mid, and late game. Wizard has a brand new skillset, Lancer and Priest's skillsets are stronger, and Summoner and Oracle are buffed. Many items for rebalanced to become more useful or a little less overpowering. Some are straight item modifications meant to produce better meta game.
The full list of changes can be found in the 13040 Release Thread.
This is a 13040 Preview Video: