In case you haven't been tuning in, both Pokemon Black and Pokemon White will both be equipped with video chat. The thing is, it'll only be usable locally, so if you can access it, you can probably spot the other player/s nearby. Sounds like a silly feature, but if you'd like to say hi to other players in the area before daring to approach them yourself, it could be of some use. Otherwise, let this Japanese TV spot show you how it all makes sense.
If you're not into waving at strangers in the cinemas, you can always just stick to the games' local connectivity mode, allowing players to interact and exchange items locally, much like Dragon Quest IX's Tag Mode.