This morning when waking up I noticed the blue light was on and wondered what was new. I had a message from Nintendo telling me that a new Metroid 3 preview channel had been release. I assumed this meant a demo, but the channel is simply a collection of trailers. Still it is quite nice. There are currently 4 trailers in the channel with more being added on August 13th.
Edit: It seems only 2 of the trailers are currently available and the other 2 get unlocked on August 13th.