The Life is Feudal team has posted an enthusiastic note to let fans and backers know that the MMO side of the game is now live on internal testing servers. While not yet open to backers, the team is confident that this will happen "soon™". Future testers will need to meet eligibility requirements based on level of backer support and will be invited in waves when the MMO servers go live.
You can check out the requirements and more by heading to the Life is Feudal site.
Via MassivelyOP.com