I dont know what it is, but I got mine and its just not doing it for me. Its my favorite suit but something about it just isnt right. I think its the matte paint as opposed to the metallic paint like on the 4 and 6. Im probably gonna sell mine and save up for one of those instead.
Do yourself a favor and dont buy Arkham VR. The story is about 40 minutes long and is wildly disapointing. I dont want to spoil anything but trust me when I say save your money.