As much as I would like to see Mijumaru's evolution be bipedal and still be cute/cool, water/fighting samurai with a katana, it says that the final form was made to look really different yet tied to the sea mammal thing, and this is a pretty logical way to do it. I love the sleek look of tsutajaa's evo, pokabu's is pretty hilarious and interesting, and mijurmaru's is ok. The leaked starter evos are way too thought out, detailed, and in line with the creators' comments to not be real (if they're fake, whoever made them probably had info about the real ones for these designs to be THIS close). I think it comes down to if you like the designs, you feel like they're real, and the people who don't like them say (hope) that they're fake.
For those who are saying that tsutajaa's evo is too Chinese dragon-esque and that it's not western, keep in mind that it's still supposed to be a SNAKE and not a dragon so of course it will look like Chinese dragon (which look more like snakes). Also, some people can't seem to see how pokabu's evos are Chinese-themed. Like what was previously mentioned above, it's pretty much the Zhu Ba Jie (豬八戒) Pig character from the Chinese Journey to the West story. See these pictures/interpretations of the pig character and you'll see how similar they look to the designs:
http://t0.gstatic.com/images?q=tbn:ZQPY0U1UsvFDdM:http://img.tv.cctv.com/image/20080124/IMAG1201157914075291.jpg&t=1
http://news.xinhuanet.com/ent/2007-10/16/xinsrc_0921004161100500046932.jpg