[Doom Chaos]

The article is just about some guy's opinion on starters. Also, nobody reads the whole sentences here.

"What do you want to bet that he'll be able to learn Pin Missile?"

That's like saying:
"What do you want to bet that Flareon will not get Flare Blitz?"

It doesn't confirm anything. It's just some guy saying that he thinks Chespin will learn Pin Missile because of flavor reasons. It doesn't mean Chespin will be a Grass/Bug type. I repeat, this article is just some guy's opinion. There are tons of opinions like these all around here, Serebii, etc.

Oh, and if you think the typings are gonna be Grass/Dark, Fire/Psychic and Water/Fighting just because of that trailer, read this.

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In the Diamond/Pearl trailer, Buizel's first shown move was Swift. Did it confirm it was gonna be a Normal-type? Of course not. So why should Fennekin UNDENIABLY become a Fire/Psychic type? It's the same logic.

Still aren't convinced yet? Dewott was revealed to learn Revenge by level-up in BW. Did Samurott become a Water/Fighting type? Nope!

Don't expect fancy typings yet. Ninetales can learn Extrasensory and that doesn't make it a Fire/Psychic type. I'm not saying these type combos are impossible, but they are not THAT likely.