Yes, the mail for taking part in Alpha 4 is hitting mailboxes around the world so check your mails and don't forget your spamfolder, just in case.
Firefly strongly recommends uninstalling Alpha 3 and then download the new program installer using the link in the mail.
"Cats are the only animals that are both uber, pwns and 1337 at the same time." -King Euric
By reading this fine print your soul is now the exclusive property of HeavenGames.