@Senshi:
He's Gray's fellow pupil who was the villain in the Garuna Island arc. I remember seeing him and Sherry on a magazine cover a few chapters back, so Mashima was probably foreshadowing that we'd see him again.
Leon and friends have had at least four cameos since Galuna island. The magazine cover, being the most obvious one. They showed up in the crowd during the parade a few chapters back. I can't recall precisely where else I've seen him, but it's been somewhat Pandaman-esque.
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GAR. Wendy is moe, and Mashima is trying to convince us that she's not a Dragon Slayer. I would have been alright with Wendy if they had just come out and said, "YES! SHE'S A DRAGONSLAYER" as was done with Gazille, but now the unveiling is going to waste build up to the plot twist everyone sees coming.
Pretty good chapter. That unicorn airship is pretty awesome, if I don't say so myself. Very One Piecey, which is what I want to see more of. More Unicorn airships. Less Akatsuki.