No email from Amazon about delay either. I wonder if Nintendo is behind the delay or something happened in production at nyko. I'm thinking its legal, if batteries explode and damage wii gamepad is that Nintendo's fault or Nyko or User fault? I don't know.
If the battery explodes and damage the WiiU gamepad, it would be primarily Nyko's fault for bad design/QA testing. Remember though, if you do any changes to your WiiU gamepad, it could void your warrenty.