Note that the 11/02/2015 Beast Tribes Quest preview is essentially the same information posted earlier including a small blurb about how beast tribes and rewards work.
Quote:After unlocking the beast tribe daily quests, players will be able to undertake several quests which change on a daily basis. By completing them, players can improve their reputation with the Vanu Vanu. At certain milestones, you will be given the opportunity to undertake main beast tribe quests, which are episodic quests that provide insight into the lives of the Vanu Vanu.
By completing daily beast tribe quests and raising your reputation, you will be able to purchase various items such as furnishings, minions, and mounts.