They are. I'm excited for Amy =P
I think Amy in this version was an actual designed character instead of a character creater made character. In the gameplay footage I've seen of her she seems pretty quick and a good comboer. She moves pretty cool too.
My Creations in Modnation Racers! Check zhem!
http://community.modnation.com/en-us/players/IvoYaridovich/creations