Well there's chest full of items and you can purchase those by completing the quest, by replaying the quest and also completing the task set. Items in there include cosmetic items that make you look like Arrav and also updates to darklight.
"
So either Solomon's has a modified version or the rewards interface in-game only includes the shield and sword.
Differences seem to be the skin on the body and the SGS configuration shows that the Arrav outfit has two different helmets/body/legs as well as a shield with horns on it as well as being
red eyes and orb (chest)
and the one they showed that's from the chest is
green eyes and orb (chest)
. SGS does not appear to be color pickable.
So maybe there will be three slightly different Arrav outfits on Monday? Geez.