Not an "OST" perhaps, but the OP is composed by the same guy who's doing the OST, Hiroyuki Sawano, so I think it's somewhat relevant.
Anime "Re:CREATORS" Opening Theme is "gravityWall" by SawanoHiroyuki[nZk]:Tielle & Gemie
Anime "Re:CREATORS" Ending Theme is "NEWLOOK" by Ayano Mashiro
gravityWall can be heard in the 2nd PV for the anime. ED information on the anime's website:
http://recreators.tv