Bearing bad news here, I'm afraid. We don't currently have a timeframe for when the Trainer Card Maker can be updated with all the new trainers, Pokémon, badges, and so forth from Pokémon X and Y.
Basically, due to the new 3D models in X and Y, and because they're on the 3DS, an entirely new platform, our usual sources won't be able to pull the data as easily as they did, for example, when Black 2 and White 2 came out. This in short means we don't have anything to add to the TCM for the X and Y release.
I am, however, committed to finding a way to incorporate everything relevant from X and Y as soon as possible - so watch this space, and I am very sorry we can't have the XY assets available for launch.