I'm calling it, we'll get a 1 second teaser of Metroid Prime 4 at the end of the showcase. Along with a slightly modified logo that will displayed for 10 seconds. Also Shinya Takahashi will do the thug shake.
I don't have a wii u anymore to test it myself, but if homebrews are not visible on the wii u menu I think you can press L + R + minus to open the plugin menu, there should be an option called "homebrews on wii u menu" or something similar
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)