The following are scans from GMR magazine.
It features reviews of the upcoming sequals to the Kingdom Hearts (which featured Utada Hikaru's "Simple and Clean" / "Hikari").
The first is called Kingdom Hearts: Chain of Memories, which will be a Gameboy Advanced game.
The second is Kingdom Hearts II for PS2.

Utada Hikaru and her song "Simple and Clean" are also mentioned a couple of times.

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Review of the GBA Kingdom Hearts game "Chain of Memories".
Here it mentions that Hikki's song "Simple and Clean / Hikari", which will also be the theme song to this game.
Fall 2004 Release.



Preview of Kingdom Hearts II, for PS2.
Mentions special cameos such as Auron from FF-X and Vincent from FFVII, just like Cloud Strife, Aerith, and Cid from KH1.
Mid-2004 release date.



Interview with Kindom Hearts Director Tetsuya Nomura.
He is questioned about the possibility of Utada Hikaru providing a theme song for the KH2.
Could Hikki be the soundtrack again?
Also mentioned is "FFVII: Advent Children"