Argh! Someone left me out of the loop! They've finally officially named 2003 UB313 ("Xena") Eris, but I don't know when, or why it's not a creation god. *grumble grubmle* I'm going to have to go huntin'.
ETA: Ah, there we go, it was on Sept 13, this past Weds.
ETAA: And care of FFS!, here's the NY Times link.