Unfortunately at this point in time there is no estimated time of release.
Every time new beacons appear on the map, this is announced on the official community page found here: https://www.facebook.com/StormfallCommunity
Hit "Like the game" in order to subscribe for Stormfall news. Keep track of our posts and feel free to participate! This will be your chance to capture a Beacon for your League.
Visit Stormfall official groups for more tips http://bit.ly/SFgroup