If you look at the videos and pay close attention to the UI, once you select the a move and the Pokemon attacks, the UI turns minimalistic. We saw it with the trailer from last week.I don't believe I saw any levels for the Gym Leader's Pokemon, it could be that gyms are more strategy focused than level focused.
They show the levels last week when demonstrating the information. It's a blink and you miss it mode. It shows both of them at "50"