PWInsider.com is reporting that WWE Network issues are still continuing as of this morning. The on-demand content seems to be having issues loading the video box. The live stream has been playing since the launch and have not faced any issue at all.
As for the on-demand content, there are major loading issues, to the point that some content is not even playing at all.
I can also confirm myself that the Playstation 4 Login box has been an issue when trying to log onto the network. WWE is still continue to work on the overload of users that signed up.
MLBAM, who has worked directly with WWE during the launch of WWE Network, told Deadspin that they have not seen anything like this, such high demand of one specific Network, in their 14 years of doing e-commerce.