How do you get to the sky wolfs in jade wolf?

Not yet but there will be :)

Jade Wolf 3 will probably be out sometime in 2012, or at most the beginning of 2013 (especially with the economy right now)

In the game, if you go to the birds on the tree between Smarty and Mata, the birds should sing you five notes. To unlock the secret, play them on the bells for Avi. (Farthest left, second farthest...

No, Jade Wolf is an amazing wolf, but most players hardly know if Jade is a male or female. I'm pretty sure that she's female, because of her green eyes and her name, "Jade" It is totally dependant...

Gray and grey are basically the same words, just that "gray" is the american derivation of "grey". So, both ways are acceptable and are the same wolf.