The EU PlayStation blog has announced the first Vita Beta and also tweeted the announcement making them a Vita Beta Tweeter.
I am hoping the person who made the Tweet was called Peter.
To sign up for the Beta follow these instructions:
1. Copy the URL “https://psnbeta.eu.playstation.com/LittleBigPlanetVita/enroll.php” and paste it in your browser
2. Sign in using your SEN account
3. You will be directed to a page saying you don’t have access; don’t worry though,
paste the URL “https://psnbeta.eu.playstation.com/LittleBigPlanetVita/enroll.php” into your browser once again and press enter.
4. Fill in the details and you’re done!
The Beta is available across Europe. Apologies for our earlier mistake there.
Signing up does not guarantee entry to the beta.
Source: EU PS Blog