Update: We've since found out that the PSN Beta portal is for testers to report on specific titles, its not related to a beta test of the network itself.
We've received word from a Twitter tweet that Sony's European branch (SCEE) is inviting users to test drive what it calls a PSN beta. The sign-up page is located here, however, those that did not receive an invite are simply greeted with a permission error after logging in.
There's no word yet on what is being tested behind the scenes, unfortunately[...]
Continue reading: SCEE Inviting Users To 'PSN Beta'...