Well, I'd actually assume that probably CoroCoro is no longer receiving information about Pokémon X and Pokémon Y that hasn't been revealed in English until the official Pokémon websites have announced about it. Knowing that the last CoroCoro had revealed Xerneas and Yveltal after the English Pokémon website had revealed them, but the only new thing that CoroCoro had revealed... was it's sizes, then the English Pokémon website added in the sizes at the same time the scans came out.
Probably the next one, which will be on February 15th... would reveal the Legendary Pokémon's types maybe. But then again... they might not reveal anything new. We'll just have to wait and see.