So far from what I can tell it's basically the Arkham costume through and through, with various details reimagined. The ab plates, for instance, are now more like actual abs and not a bunch of armor plates. You still have the orange stripes on the main chest plate, with the little front collar piece. Shoulders are basically identical as well (not clear if they're still shotgun shells tho). The helmet is pretty similar in shape, but it doesn't have those weird creases on the side, and it's more symmetrical (the Arkham one is basically completely smooth on the blind side, this one has the same shape, just the eye that's covered). The coloring is different, tho with the big piece over the forehead.
On his back, he seems to have a katana and possibly another combat knife, from what I can tell, and I'll go over the legs later, but they seem relatively similar to the regular Origins one, too. To be honest I'm surprised how accurate and pretty much spot on they went for good ol' Deathstroke here. This is a damn near spot-on representation of the very popular Origins look :3 I'm honestly considering doing this as my next project.