To build off of this, the official Japanese Pokémon Card channel, if you're still having troubles locating it, can be found here.
Thanks. The whole point was that I was searching for the official Japanese Pokemon Card channel and couldn't find it.
EDIT: Okay, looking at that link, it seems I did find the channel yesterday, but I didn't see the video about the new theme decks. The newest video posted to the channel at the time I checked it seemed to be a pack-opening.