Preregistration for Ravnica Allegiance is up on our site, which you can find in the link below:
http://www.da-planet.com/catalog/event_registration/13693
Due to some technical difficulties, we do not have pre-orders for the Booster Boxes yet and we will announce at a later date when they are up.
As a reminder the final prerelease event (5:00pm on 01/20) will be a 2-Headed Giant Sealed. Only 1 order needs to be placed per team.