FFXIVCore translated the new Dengeki article, and to my big surprise there's some new information in it. I'll quote the non-speculation parts here, you can read the whole article in ffxivcore.com
Edited, Jan 1st 2010 12:48pm by Hyanmen
The location of FFXIV is Eorzea, a region comprising of the Aldenard continent and the surrounding islands. The Garlean Empire, which has done a number of invasions, originated not in Eorzea but in a territorial state in an eastern continent. Therefore, that nation has invaded groups of state nations in Eorzean civilization. The battle scene on the official site trailer shows the fights with the Garlean Empire. We cannot tell you what that battle is yet, but it does have something to do with the Adventurers' ability to "change the World." This power is to relive the past events does not mean to come and go the past and the present like in FFXI's Wings of the Goddess. Plus, we cannot tell anything about the origin and nature of this power, for it is deeply connected to the main part of the story. You have to play and figure out the truth by yourself
Character customization is much freer than in FFXI, but the creation process is done in such a way to bring out the special characteristics of the different tribes, like they hyur mid-landers and high-landers or the miqo’te Sun Seekers and Moon Keepers. Furthermore, depending on the class you choose there will be a few things you can change about your starting armor.
Magic in FFXIV has two properties: "directional property" and "school of magic." This means, even HP curative magic spells can be different in the amount, area, time and MP cost for the spell. As for new magics, there are famous spells from the FF series which are not used in FFXI since they were not suitable for MMOs. Those spells are difficult to apply in FFXIV, also, but we won’t yet say that we are not going to use them. Moreover, even if they have same names as FFXI, there are some spells which have been dramatically changed in FFXIV. Please check them out.
This time, weapons make adventurers’ classes, but in FFXI, characters with swords, such as paladins and red magicians, could also use magic. In FFXIV, it is not class that will define this, but it is possible to use both swords and magic depending on the character’s growth. There are still a lot of parts being discussed, so please look forward to it.
In FFXIV, each area is very wide. Moving between the sunlit fields and the dim dungeons is seamless with no area change. There are pictures with really dark dungeons that may make you think of exploring dungeons with a torch, but the dungeons are made in such a way that torches will not be needed.
Caption: The dungeons in Limsa Lominsa are crawling with water monsters. There are crabs(?) bigger than roegadyn!
“Beast tribe” is a name given to these people from the government. They look different from the people living in the cities and have different philosophies and religions, but they have their own culture and knowledge. Eorzea is now a three-way deadlock between the “people” of the empire and the “people” of the beast tribes, and adventurers sometimes get caught in the crossfire. According to the setting, the two are irreconcilable, but they do say the enemy of an enemy is a friend… not to mention, not all beast tribes view humans as enemies, and there may be those that live peacefully, those that betray, and even those that try to make deals with humans.
As for the normal monsters, their behavior in the field has also evolved. In FFXIV, as in FFXI, monsters can be categorized as passive, aggressive, and linked, but in FFXIV there are also monsters that are in packs or monsters that prefer to live alone. There’s also a food-chain sort of relationship planned.
Lastly, the “summons” existent in other games in the FF series also make their appearance in FFXIV. However, unlike FFXI, these summons are closer to god-like existences, and in order to gain their help, even higher hurdles must be overcome.