There will be an event for Canadians to download the Secret Key from participating retailers from April 19th to April 26th. This isn't the assumed event that can be downloaded over the Wi-Fi. Instead, this uses a local network that you have to go to and download from a download station.
At this time, it is unknown if retailers in the United States will follow suit.
So, Canadians can assure themselves a Secret Key if they don't have Wi-Fi access. Rumours have found their way to also saying that the Wi-Fi event might be taking place at around the same time, so keep checking back, we will update when we find out.