Much of the big XY news we've gotten so far has NOT come from CoroCoro. The starters were revealed via Pokemon Direct, many of the game elements were revealed by the Pokemon website themselves, so, in contrast to previous generations, much of our brand new news has not come from CoroCoro. They've been mainly backstage for most of X and Y. That's not to say they haven't reported the news, they have; they've just not been the first ones to have it. The "scoop of the century" may be CoroCoro's way of saying that they have the news first this time, and they want to drum up sales for the magazine claiming that they have exclusive news. So, hopefully it's something really big!
I'm hoping for either the final starter evolutions (it's a bit early, but hey, this generation all the rules of news we've seen in the past have been broken already), another Eeveelution (though this is unlikely, since it would overshadow Sylveon) or more game details/new pokemon. It would be great to see another legendary or the legendary trio before the games come out!