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The theme song of Kingdom Hearts 2.8, Utada Hikaru's Hikari (Ray Of Hope MIX) will be released on an EP for digital download from the Japanese Itunes store one day before the Japanese release of the game itself and will cost ¥750 (about $6.57)

The EP will include the following four tracks:

1. Hikari (Ray Of Hope MIX)
2. Simple And Clean (Ray of Hope MIX)
3. Hikari (P's CLUB MIX)
4. Simple And Clean (P's CLUB MIX)

The cover art (featured above) for the album will feature the artwork of Tetsuya Nomura, created back in 2014, as an 15th Anniversary gift for her cover album.

EDIT:
The EP should now be available for be preorder in all countries! Check your country's Itunes store and find out how much it is.

For the US, it is listed under Simple and Clean (Ray of Hope) Mix and costs $3.99.

Source: Official Kingdom Hearts Twitter