Final Fantasy XIII:
The new male character's name is related to weather, but not related to the female lead character Lightning
The summon beasts are vastly changed, for example Shiva can now transform into a motor bike, and she can use more than one element, not limited to blizzard
It is possible to transform the summon beasts into other forms like motor bike during the battle
The crystal will give user the power to invent/compose certain things
There is a city inside a floating Cocoon, which is formed by the crystal and protected by a machine
There are some mysterious changes in the crystal, causing the cocoon "awakened", people fear those who live inside the cocoon become invaders and begin to hate them
To stabilize the cocoon, people performed emergency treatment to it, banished residents inside the cocoon and move them back to the ground
The Crystal chose Lightning (the female protagonists), give her fate to lead the world. People believed she's an enemy to the human race, she will lead the world into ruin.
Final Fantasy Versus XIII:
The gameplay will be similar to the Kingdom Hearts series, with more action elements than the FF series
The male protagonist is capable of teleporting to where his weapons are thrown.
He has some sort of limits to his power.
Originally there was no good or evil, but soon it will be divided between the two, in the last Kingdom where the crystal was held
The Kingdom is very advanced in technologies, and isolated from the outside world.
The Kingdom is protected by Magic Order, but a group of invaders from outside began to invade the city for the crystal
Final Fantasy Agito XIII:
The game will be in full 3D
The protagonist is supposed to protect the crystal
The game will be available on mobile phone by the end of 2007