Forever changes
Improved Mark of the Wild baseline (Official); Omen of Clarity baseline for spells/heals/melee; Revive (out-of-combat res); Eclipse, Balance of Nature, Nature's Grace change, Moonkin aura to all crit (Balance); Berserk, Mangle, Lacerate, Tiger's Fury rework, Furor/powershifting change, King of the Jungle (Feral); Wild Growth, Swiftmend no longer consumes HoT, Gift of the Earthmother (Resto); DoTs/HoTs can crit. Skyborne druid forms new (Official).
Confidence note
Official (Blizzard) (baseline Mark, Skyborne forms) + Reported (single credible outlet, BlizzCon demo build; subject to beta change)