The SoC was chosen because China were hosting the Olympics that year. This year England are so really if they're going to do another Olympic pet it should match the host country again (and be something like Imthedci suggested).
Then again I'm from England, so I'm perhaps a little biased in hoping for a new Olympic themed pet...
I know. I was just saying that given Blizzard's track record (no pet for the last olympics, no change of pet for the arena tournament, no longer giving out new pets every year on the anniversary of WoW), the most likely occurance of an olympic pet would probably be a recycle. It's the spirit of competiton, not the spirit of pandaria competition.
I wouldn't be opposed to a new spirit. Perhaps a lion that matches the alliance guild lvl25 mount? As I'm not from England, the only national connection my brain is making between there and the olympics would be a "mad man in a blue box" pet.