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muahaha...I know EVERYTHING!!!! LoL, actually i only know what i have read from this site:
http://kingdomhearts3.net/
Which is actually a LOT. There's actally gonna be THREE new khgames coming out!
Kingdom Hearts Coded- Mobile Phones
Kingdom Hearts 358/2 Days- Nintendo DS
Kingdom Hearts Birth By Sleep- PsP
yaaaaaaay!!!!!!!!! Hooray for waffles!!!!! Check the about section in my profile for a breif summary if u dont wanna read the whole thing (tho i HOPE you read the whole thing)

hi

i know all about da chasers & that the game was before sora was born and its related to xemnas and that the chaser's story is 100% like sora's story... there were 4 chasers and 4 roads ... 2 of them chose the road to twilight and happiness (sora and the king)... and 2 choose the darkness and hate (riku and xemnas) but one of the dark chaser wanted to come back(just like riku) and thus there was the famouse battle which u can look at in youtube

ya, the names of the three "heroes" in that video are...
terra (big guy with brown hair)
ven (basically roxas [just gets owned. unlike roxas])
and aque (blue haired girl. i guess she's like a mage)

but the game accually takes place befor the time of the heartless and nobodies.

Let's see..

The three main characters are
Terra - Earth
Ven (Ventus) - Wind
Aqua - Water

This also relates to how
Sora - Sky
Riku - wind
Kairi - Earth

The game will have three different scenarios, each evolving around each of the characters. You will have to finish all three to fully understand the game. The plot is mainly about the three keyblade apprentences looking for 'Master Xeonhort', which is traveling with his clone. You will fight a new kind of enemy, neither heartless or nobodies. This new type is very fast. It is time set before kingdom hearts one, and the returning worlds will have a time set beck, such as a young herculies at the coloseum.

All three of the Main Chars will have their own styles of combat, and will occasionally encounter each other throughout the game. The time set is ten years before KH 1.

Summary
Birth By Sleep takes place about 10 years before the original Kingdom Hearts. Before Sora wielded the Keyblade, there were other Keyblade masters. One of these masters, Xehanort, disappeared one day along with his apprentice. Another master of the keyblade saw this as a sign of terrible things to come. So he ordered his three apprentices (Terra, Ven and Aqua) to seek out Xehanort and his cohort.

King Mikey, Donald, and Goofy will make an appearance, however, Donals will be working as Yen Sid's apprentence.

At Jump Fiesta, they showed some of the gameplay. The game will include finishing combos and reaction commands.

That's about all I know! Let me know if this helps.