Online store Animate just recently posted listings for "25th Anniversary Rockman Rock Arrange" and "25th Anniversary Rockman Techno Arrange" albums. Due out on August 29, the albums contain arranged versions of music from Rockman 1 to Rockman 10. Each will retail for 3,150 Yen (approximately $39).
It remains to be seen if these are newly arranged pieces or compilations of previously arranged music. I suppose Capcom will officially announce the soundtracks in the near future, so we shouldn't have to wait too long for additional details.