Since I didn't see anyone post anything about the beta/stress test going on today/tomorrow...
Download is up on the eShop now, about 560 MB. The beta will be online for 3 different 1 hour segments:
May 8th - 11pm-12am ET (8-9pm PT)
May 9th - 7-8am ET (4-5am PT)
May 9th - 3-4pm ET (12-1pm PT)
Nintendo putting their spin on a shooter is really interesting, planning to check it out later!