My opinions:

Tamanta looks like a smaller, cuter version of Mantine, it could have been a little more original though, it's much more of a clone than most prevos in the past have been.

I like the parrot, cool idea. It's English name could be Parrap for Parrot + rap, similar to its Japanese name. I don't think it will be a pure flying type, flying has always been a second type since Gen 1 (there have only been something/flying and never flying/something) so I just don't see this happening unless they go back and change all the old normal/flying types to pure flying, they have changed types before, just look at Magnemite/ton.

As for the weasel, that does look like some kind of floatation thing around its neck, maybe its name could be bouy-related.

Manaphy could be the new Mew-like pokemon but it just seems odd for them to release it before the games (and most of the other new pokemon for that matter). I'm not completely ruling it out though, and if it is, then I definitly see another secret pokemon after it, like Deoxys, that we're not going to find out about until people start hacking the game.