This will allow for a lot more freedom and it'll make FFXIV Gil  quite solo friendly. A warrior who wants to be cured of poison can easily change into a healer by himself. So, having plenty of inventory room is far more important than it was in Final Fantasy XI.

In order to increase in specific areas, Square Soft recommend to balance your equipment parts between the inventory slots. The level of your equipment is essential in Final Fantasy XIV Gil, its more important than your character's "level" itself. Square Enix mention the freedom of the system yet again and that it becomes a lot more flexible and fun having such a system in place. The team behind FFXIV has deliberately chosen to avoid the usual job classes, instead chosing much more neutral names.

Battles
The fights in FFXIV are in real-life, although they wont be as action-packed as some might be used to from other MMORPGS. There will be more strategic elements in place. Check the trailer for certain speculations.

Items will degrade in durability (resistance?) depending on how much they're being used.

Guild System

Passes of "trust" exists that you get from guilds
There's something called a "Leave", it isn't a quest, it's a card
Mixing your own Leaves with other players Leaves is possible
Visiting the Adventurers Guild you can obtain Guild Leaves
Even when your skill is low you can get Leaves
The approx time of completing a Leave is around 30 to 40 minutes
You're able to set who and how many can do a Leave
Even if only one player carries a Leave, other players can join regardless if they have the Leave or not
Contests of the Leave changes every week
You can carry as many Leave cards as you want
Apperently the Guild Leaves are quite beautiful, designed like tarot cards

FFXIV sports a complex, advanced, FFXIV Gil and interesting guild system. There are so called permits/licenses in the form of illustrated cards that match missions that your character has to complete. You can share these licenses, i.e having the card or not having it and also decide on how many that can be part of a mission.

The level of each player is mostly non-relevent, but some licenses has a certain level requirement. These wont take longer than 40 minutes to complete approx. Oh and you can carry several licenses at the same time.

Some of the goals of the licenses are:

Killing monsters, skilling up, raids and more. These are called "etherites" (spelling) and will let you get instantly teleported to said area.