From the desk at Paradox:
NEW YORK – July 6, 2012 – Paradox Interactive and Fatshark announced that, after recently completing a successful closed alpha, sign-ups for a chance to participate in beta testing for upcoming medieval multiplayer combat title War of the Roses has now opened to the public. Starting today, players can enroll to be a Knight in the King’s army and help restore order to England by visiting the following link: http://www.waroftherosesthegame.com/
When signing up to guarantee their access to enter the beta, future knights will obtain a unique referrer URL from the King that can be shared across social media channels. When five friends use this player-specific link to sign up for the beta, the player who is linked to the URL will be granted a secure spot in the beta.
I saw this back in January in Stockholm and it looked pretty damn good, particularly if you were a fan of the multiplayer component of Mount & Blade: Warband.