Evanescence has also started to take a bit different musical direction as of late than We Are The Fallen. If anything, WATF is continuing in the vein of the older Evanescence sound, where Amy is going her own way (which seems to be more electronic based than rock based from snippets that I've heard) with Evanescence.

At the current moment, they're two different style bands, so I disagree with the "copycat" position. :)