Mists of Pandaria - Patch 5.1 PTR Coming Soon

[bbr]

Upgrading pet rarity sounds - like they need to invent a better name for that system.
A pet is either rare or it's not,.. you can't suddenly make a pet "more rare" unless you can kill off and prevent other players from getting them...

[Noxia]

Upgrading pet rarity sounds - like they need to invent a better name for that system.
A pet is either rare or it's not,.. you can't suddenly make a pet "more rare" unless you can kill off and prevent other players from getting them...

That's just nitpicking. If a common pet has stats x and y and then you upgrade it so that it's stats are x+1 and y+1 then it will be more rare than the regular version with lesser stats.