Clarice Disc just put up a 11-minute sampler of this upcoming Sunsoft Remix album on YouTube:
http://www.youtube.com/watch?v=MK1VHPdXTvw
According to this page, there will be a second disc:
http://claricedisc.shop-pro.jp/?pid=35053264
A Google translation implies that the second disc will contain composer Masashi Kageyama's original versions of music from
Gimmick!, kind of similar to the original demo versions on the recently released Sonic 1 & 2 soundtrack? Anyone knowledgeable in Japanese who can confirm/deny?