I've got the NPC's done! Actually, they're already up... except they're not. It looks like the Single Player arena doesn't acknowledge any new NPC's until the maintenance server reset. Funny, I don't remember that being a problem when we tested it on the test server last week.
Anyway, at 6:30 this morning EST four new NPC's should magically appear. And, for everyone who defeats the new High Level NPC (level 30) tomorrow (Saturday the 20th, I'll give you 5 Point Cards! (Max one prize per account).
"Scissors are overpowered. Rock is fine." -Paper