Here are my two cents about this new GBG feature:
1) Make the league feature be a server wide competition. If you limit it to be one world only then the same guilds will compete against each other every time and it will become boring very quick.
2) Attrition needs to have a gradual cooldown rather than a reset time, in order to prevent the well known reset time issues.
3) Negotiation need to be limited by a attrition-like system as well (make them more expensive for each one you win) or they will be balanced really poorly.
4) Please dont discontinue GvG - I know you claim that this is not the intended purpose, but I am a bit worried to be honest.
Other than that I am already really excited to play the new feature soon.
Thank you A number of players have noted the same, and they've been included as part of our player feedback.