Summary
Wowhead's datamine of set bonuses lists a Druid 'Embrace of the Viper' set (2pc Intellect, 3pc Attack Power, 4pc 'Embrace of the Viper', 5pc 'Dream Venom') and a new 'Grovekeeper' Druid raid tier with separate Restoration, Guardian, Balance and Feral pieces. It does not mention a form transformation; datamined bonuses may change.