Well, based on what WPM said, Parabolic Charge was inside, and confirmed recently.
Then this morning, CoroCoro finally gave us the first major X and Y details since the games were first announced. Among those details was one tiny little tidbit that the source had first told me about in February - that there would be a new Electric move that drains its opponent's HP. This was the only attack that the person had told me about in February, and yet it is such a specific detail to make up. For that information to be verified three months later seems to indicate that the source is the real deal (unless they are just really good at guessing).
Of course, even WPM says it needed more than one attack to validate his source, but he went ahead with all the other inside info the source gave, which were the rumours PB posted.