Early this morning US time, Atlus had a 3.5 hour pre-release livestream for the HD Remaster. This included 2 musical interludes with Yuzo Koshiro, Noriyuki Kamikura and Daisuke Miyazaki performing arrangements from the series. The first section starts at 29:52, and the second section kicks off with the brand new 戦場 露と消えよ (presumably the replacement tune I mentioned in the previous post) at 3:04:04.
https://www.youtube.com/watch?v=Av7sfLOjpro
Koshiro also joins the panel discussion beginning at 1:13:15.