First of all, because I HAVE TO. I know it sounds ridiculous, I'm not one to buy anything just because it's coming out... But I really love pokémon since Blue and I love how things have been developing over the years. I know I have to get this on release day because everything about the trailer is appealing. Except the frog starter, but it's not THAT bad, I can live with it.
The genetic hints, the awesome possible Fire/Psychic starter, the Chespin (Grass Starter) looks awesome, strong and fast. And the fact that this is a 3D Gen, which is a huge step for pokémon as we know it. I have to see it and I know I'll love the outcome, Gamefreak did a great job so far so...