Some info on Jar Jar from an informant:

He's finished in almost all shots and looks really cool. I was afraid he'll be too cute, but he's OK. Your sketch looks really like him, except that your sketch looks like he has hair. In fact, he has two enormous flat ears (or even wings???) that cover his head and hang over his back like come sort of cape. They come almost exactly to his waist, but remember that his waist is much higher than normal human waist (see Barbie). I also saw some other Gungans that had completely different ears... Wait! It just occured to me! Jar Jar is probably supposed to be "wild" (he says he was banished from the city), whereas the others are "domesticated"! Their ears are cut at shoulder length and they even have some sort of decorative edge on them - so they really look like a hood.

Hmmmm....we're not so sure about them being different species, but we do know that there seem to be variations on the Gungans. Keep watching for more details!