It appears Alpha invites are being sent out for Bloodborne to PSN users who have platinum in any of the Souls games released by From Software.
According to various postings from recipients, the invites for the “exclusive Bloodborne Alpha Test” are not a guarantee the recipient of the lovely email will be chosen.
Invitations so far have been handed out in the SCEE region with a link to a sign up form.
The full email can be seen on Gamechup.
Source: VG247 and Gamechup.