No but it makes sense given what we know about it. Having it turn into a random dog thing makes no sense.
We don't really know anything about it though. We know its a Water Type and has two new attacks. It has a water type Slash and Water Oath. That doesn't really lead to it being a Fighting type.
The Pig IMO has a better chance at being a Fighting Type.
From different talks I've had most of the people I talked to say
Tsutaja would be Grass/Electric or Grass/Dragon
Pokabu would become Pure Fire or Fire/Fighting
Mijumaru would be pure Water or Water/Ice
We can voice opinions on typing but nothing has been declared as official by Nintendo or Game Freak concerning the evolutions. Even the beta art hasn't been confirmed to be their official forms.
The guy on Serebii simply said that the source for this pictures has made accurate leaks before on Black and White's new features and systems. No one knows if the above is fake and we can't just say "Oh they are fake." just because of how we feel about them. Zekrom and Reshrim were raged about the same way. They look like Digimon by their coloring techniques and the way they are built.
Now I really don't like any of these save Mijumaru's Evolution. Tsutaja's reminds me of Melaficent and Pokabu looks like something from Disney and then transforms into Jimbee from One Piece. I'm hoping that these aren't official myself but no one can say for certain what is fake and what is real until Game Freak says so or the original Artists comes out and says they were fake.
Seeing as the news guy for Serebii trusts the info, I'm going to wait for an official announcement.
I did not say it was going to be a fighting type I said it is most LIKELY a fighting type. It learns a fighting move and had a samurai type position in the new anime series preview those point to fighting type.
Scyther and Kabutops have swords for arms and Scyther's style in the Anime is based off of Japanese sword styles. Neither of them is fighting type.
Mijumaru's attacks that have been presented are Shell Blade (Possibly renamed later in American Version) and Water Oath. I can't find anything of Mijumaru learning Fighting attacks so could you link me to their videos?