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Greninja has the possibility of being OU if he can learn some decent boosting moves. Water type Infernape with a pretty good typing.
Furfrou, depending on its movepool, has the possibility of being a good bulky tank.
Dragalge has a pretty niche type combination of Dragon/Poison.
Pangoro had really good stats. Depending on his movepool, he could be OU too.
Aegislash, depending on how his stances work, is easily OU.
Klefki, granted it has an amazing movepool, will immediately be OU.
Not counting any of the megas for the moment, seeing as how we don't even know how we'll playing with these guys.
Sooooo, I'd estimate about 6 guys having the possibility f being OU.
Too many Pokemon this gen had such shitty stats.