There are very little details on it, but Falcom has posted the Nayuta no Kiseki soundtrack on their mail order site.
There is no cover, no date, or track listing as of this point. They should update this soon, however.
What is known is that it is two discs, with 33 tracks on disc 1 and 27 tracks on disc 2. It will be priced at 2980 yen.
I will provide more information as it comes out.