According to PWTorch.com, when WWE sent out an email blast earlier today, it was labeled as "WWE Event Reminder: WWE Network Announcement," and Wednesday was listed as the date, which would coincide with the date of the "groundbreaking announcement" being made in Las Vegas.
The advisory email that was sent to WZ did not contain any mention of the WWE Network, but it seems that email was sent out after the initial blast spoiling tomorrow's announcement.
As previously reported WWE will be making the announcement tomorrow night at 9:30pm EST, and you can check it out live at WWE.com. Triple H, Steve Austin, Vince McMahon, Shawn Michaels, John Cena and Stephanie McMahon will be on hand for the live announcement.