I'll try and test it out once the kiddies are in bed. I believe # of pets does affect the value. An easy way to test on live for comparison is to find a team of wild pets that are the same level as the arcane eyes outside karazan and see if EXP differs between the multiples and the single eyes.
EDIT: Did some quick tests on beta
level 25 single pet from Shadowmoon Valley: 13600 points
level 25 3pet team from Vale of Eternal Blossums: 13600 points.
I'll try and test live tonight.
I will say this is a slight buff from live in terms of levelling from pet battles. On live, it generally took around 100 pet battles per level once you hit level 85 and up. 13600 out of 775k is on the order of 50ish battles. So levelling via pet battles doubled in speed.