From another forum
This might not be official and just some guy with a Killzone_beta PSN account, but I thought people would be interested here.1) Read this: Killzone Beta Ramping Up?
2) As I'd not had one I decided to add Killzone_Beta to my friends list.
3) Had a message from Killzone_Beta 30 seconds later saying this:
"Attention PLAYSTATION 3 User,
PLAYSTATION NETWORK is getting Killzone battleready, and we're looking for beta testers to provide crucial feedback. You must have access to a PLAYSTATION 3 system that is connected to the internet via a broadband connection, an active PLAYSTATION NETWORK account, and be 18 years or older. If you want to participate in this beta, simply reply "yes" to this message and you will be notified via email if you are accepted.
Sony Computer Entertainment Europe"
4) Replied to Killzone_Beta saying "yes".
5) Killzone_Beta disappeared from my friends list