If you want to take part in the PS4 beta of PlayStation Now but you didn’t receive an invite yet, 6,000 codes have been made available right as I write on the E3 app.
All you have to do is to go into the “Service” area of the app, and grab your code, hoping that you make it in time.
If you don’t, you can try again tomorrow and the day after, as 6,000 codes will be given away every day of the Electronic Entertainment Expo.
Update: the allotted number of vouchers has already been assigned for today. If you didn’t manage to get yours, you’ll have another chance tomorrow at 12 PM PDT.