Thank you for your interest in the Flex SDK and Flash Builder pre-release program.
To join the pre-release program please follow the link below and sign-in or register on the Adobe pre-release site:
https://prerelease.adobe.com/callout/default.html?callid=2D5D97978B16445AAD67ECEDCBB5380E
Thank you.
Flex SDK and Flash Builder product teams.