Part of the reason I'm concerned is the changes made to drops in the arena.
-Prior to the patch, a run through the arena would yield a minimum of 4 SS pieces, at least one necklace and handfuls of tags.
-After the patch, everything ONLY drops tags. Necklace is still available at vendor in the final half, but not on drops.
A change to the loot drop tables for the dungeon and the F3 text changing make me think it's no longer available at the arena.
I've run it 30+ times already prior to the patch and twice afterwards. It'd be a pointless endeavour to keep running it if it's no longer there.
Unless they change the name to "Infinite Runs Challenge"!