Straight from the newsletter..
Click the 'edit' button in the 'web hosting' column for any of your fully-hosted domains, then select "PHP 5.3 (FastCGI)" from the "PHP Mode" dropdown. Submit the form and MERE MINUTES later you'll have the latest and greatest.
However, what I click on the PHP Mode only 5.2 is available? I'm on mcgurn.
What am I missing?