Expansion teams doing well is not that unexepected. In the past, your average expansion team has hit very close to .500.
Now, add to that, that Austin has an amazing QB, and both Austin and Phili have veteran coaches, and you'd expect both to do well. I'm surprised at Phili's slow start, as well as the Voodoo's fast start. But I seriously expect the Voodoo to crash and burn soon.