I know this has been mentioned before but I am still a little foggy. Assuming I am using a powered USB hard drive, am I going to be able to download Wii U games to that storage or is that only for things like media and such ?
Yeah, your assumption is right. The expandable storage is for Wii U downloads and game saves and stuff like that. I don't know about media however. The Wii U formats it for use when you plug it in.