As is mentioned before, there would be a 15-page-long cover story about One Piece in Issue 2010-08 of the Japanese magazine "Nikkei Entertainment!" (「日経エンタ」
. The magazine is released today, and the cover story includes a more detailed introduction on the new opening song One Day performed by the band The Rootless. Some details were reported by some users on the Japanese BBS, 2CH.
According to the words of the people in 2CH,
the lyrics of the new opening song were decided after a careful selection among thousands of keywords and sentences, which "can fill a whole university notebook"! (「1 冊の大学ノートにキーワードや歌詞がぎっしりで歌詞考えたらしい。」
It may be an exaggeration, though.
In the lyrics, there had been supposed to be a sentence saying that "Your Smiling Face Emerged in the Sky, and That Kind of Future Will Come True from Now On" (「空に君の笑顔浮かべて、そんな未来を今から叶えていこう」 at first. However, these words were modified into "You Should Go on Facing It No Matter How Many Times, For You Dont Want Precious Things Lost"(「何度も立ち向かい続けよう、大切なもの失いたくないから」 later on.
Because the Marineford Arc is far different from others and its full of serious scenes, said one of the One Piece anime stuff, the new opening song will not be vivacious with the theme "dream" and "adventure" like those opening songs before "protecting what is precious" will be the theme of One Day.
ルフィが兄エースを救出に向かう、今までにない真剣な場面が続くシリーズ。これまでのように夢や冒険という言葉を乗せた元気な曲ではなく、大事なものを守りたいというメッセージを込めたバラードに仕上げてもらった。
People in 2CH also said that the release date of One Day is delayed for its selected to be the new opening song of One Piece anime, and
the lyrics might be spoilers in a sense if it were released too early.