Final Fantasy XIV will have to wait until next Tuesday to enjoy all of the content added in patch 2.3. But you can get a head start of sorts by checking out the preliminary patch notes. Sure, the notes list all of the features that everyone knows about by now, like Frontline and new dungeons, but there are some gems in there for players that we hadn't expected.
Players will soon be able to augment artifact armor and the upgraded form of said armor so that the equipment may be colored as desired. Inn rooms will include a new toy chest for playing minigames, starting with the Parley minigame last seen in 1.0. There's also a wide-scale revamp of Gladiator/Paladin weapons; knives and daggers have been removed from those classes and will be available to Rogues/Ninjas in the future. Check out the full patch notes on the official site.
[Thanks to Kythas for the tip!]