These are just the trials. After the Devs do get data and do a few more possible updates, we'll be able to independently do estoc wars
Read the description in help. The beta period is over, and the estoc trials are now here to stay. It is a "trial of arms" in the game, not a trial period for the game feature, lol!
The devs plan on making it a war type so they will be reoccurring event. However the only weekend wars at the moment are to make sure the wars will be finished and equal as possible.