Looks like its tied to the amazon app store app, it wont launch unless you have the amazon app store installed.
UPDATED Got it to work outside of the fire tv:
Modified the apk to work on other android devices. i belive it only works on 4.2 and above (Sorry Ouya stock people)
*Updated with 1.0.1 Version*
Hope this isnt against any forum rules. the application is free and wont work unless the person pays for WWE Network Subscription. Which i DO