The remake of NiGHTS into Dreams appearntley will be a Japan exclusive for the PS2 only as Takashi Iizuka said:
And the PS2 is not very popular in Japan. And the reason for the Japan exclusive release is:There are currently no plans for the PS2 version to be released outside of Japan, and no plans for a Wii version either.
Japan had a high demand for it so i have started a petition to at least try and tell Sega that we do have a high demand for the game too so please sign, the link is in my signature.It is being released in Japan, due to the high demand for the game. So there are no plans for a worldwide release... so far.