So, the arena rankings currently showing are craziness. I'm hoping that this is a display bug, as there are several names in (so far) up to 4 slots.
Unfortunately, I cannot read the player names, but as of 10:20pm UTC, here's a quick glance list:
Rank 12, 22 are held by ????#17683
Rank 31, 33, 37, 39 are held by ????#98071
Rank 40, 44, 52 are held by ????#20335
They're too far apart to properly screenshot but if need be, they're rampant and I can easily find them.