On the “Contact Us” page on Media Molecule’s website (the company that makes Little Big Planet) there is a “Beta Trial” section that says:
If you are interested in being involved with any beta trials, you’ll need to join Sonys Beta Trial Programme. You can get in touch with them directly by emailing: betatrial@eu.playstation.com
Send them an email if you are interested – I did ;)
I sent them an Email… Im actually really interested in being part of a beta program like this even if it is not for LBP. Lets hope this all goes well. Any luck with you?