Druid:

animal companion level is equal to the sum of ranger+druid levels

animal companion shares spells with master; as long as the animal is within 5 feets from master, any druid spell cast on self will be duplicated on animal as well

new spells: longstrider 1, magic stone 1, goodberry 1, owl's wisdom 2, endurance 2, cat's grace 2, spike stones 4, baleful polymorph 5, call lightning storm 6, fire seeds 6, whirlwind 8, mass drown 9

spells summon creature I-IX replaced by summon nature's ally I-IX which summons creatures as would summon creature spell of one level higher

removed spells: circle of healing, owl's insight, awaken, nature's balance

all druid/shifter shapes will use character's strength/constitution/dexterity if it is higher than what shape provides

all druid/shifter unarmed shapes will now properly take effect of all weapon feats for unarmed including devastating critical hit

all druid/shifter shapes are merging also “items” category

“items” category now consists of arms slot too, so druid will merge gloves/bracers.

the way that merging the weapon slot and the arms slot works is as follows: in a shape with natural weapons (e.g. Dragon), the damage and defensive properties from the arms slot merge, and only the defensive properties from the weapon slot merge. On the other hand, in a shape with weaponry (e.g. Kobold), the damage and defensive properties from the weapon slot merge, and only the defensive properties from the arms slot merge.

ability bonuses, skill bonuses and saving throw bonuses from merged items stacks together

polymorphing doesn't decrease spells slots, however most of the times, the spell slots that would normally be lost will be “depleted” after cancelling the polymorph

humanoid-like shifter shapes (minotaur, kobold, risen lord, rakshasa etc.) can use miscellaneous items such as scrolls, wands, healer's kits etc.