I am a big fun of Wild Shaping Druids, having played them in every edition of Pathfinder and its predecessor. I have been taking a look at the Wild Order druid extensively and realized that this option has a number of problems that need to be addressed in the final version.
First, pre level 4 you don't wild shape unless you want to die. Pest Form should be an option but there should be an option to give you a small animal form with AC 17, +4 to attack, 1d8+3 damage.
Second, the Wild feats give you access to forms but you have to take them in order to scale, with a few exceptions. Furthermore, the feat breakdown really blows with multiple options coming at the same tier that should be redone for better feat progression or better yet combined with other options.
These feats should offer very small bonuses to wild order druids to make them just a little better shapeshifters. For example as it stands right now a wild shaping druid can't attack ghosts or incorporeal critters. Either the spells need to count as magic attacks or the Wild Claws power should let all your attacks while Wild Shaped count as magical. In addition, there is no difference between a Sorcerer casting Elemental form versus a Wild druid assuming that form with the exception that the Druid is a level behind. These small benefits could make the difference.
Ideas for this might include:
Animal Form, Wild Order druids gain magical attacks while wild shaped and can spend there unused highest level spell slots to wild shape.
Insect Form as normal but includes the benefits of the Form Control Feat. Form control should also include an option to transform into Pest Form level for 8 or more hours. Druid and other shapeshifters in stories often sleep or travel long distances in there wild shape, something that the current version doesn't allow.
Dinosaur Form - Increase the athletics bonus of forms for wild order druids by 1 while wild shaped.
Aerial Form - increase the speed of forms while wild shape by 5'.
Elemental Form - Increase the AC but not TAC of forms by 1 while wild shaped.
Dragon Form - Increase the damage of forms while wild shaped by 2.
This makes the Wild Order Druid a slightly better shapeshifter than other casters.
Third, forms do not scale after level 15. They need to put in options for scaling to level 9 and level 10. The current option is the druid vestment which in my opinion is bad design. Furthermore it doesn't allow damage to scale so the forms fail to advance. This needs to be addressed by either a way to scale forms like Monstrosity, Dragon, Elemental and Dinosaur to more powerful but same size versions, and even include high level versions of animal/aerial spells.
Furthermore Monstrosity form should be a feat at level 16. Since you don't get a class feat at level 16 I suggest gaining this feat instead of Master Spellcaster and replacing legendary spell caster with the ability to scale forms to 10th spell level. As long as the final version is just a bit behind the fighter it should be fine.
Fourth, the Shapechange spell is broken. The capstone ability of Wild Order Druid actually penalizes them for using it and given its short duration the ability to change what you are is not as strong when you are dealing with 1 min duration abilities. Wild order druids are better off grabbing a 10th level spell for Nature Avatar but then they fall behind Wizards who can use their arcane focus to do it twice. Shapechange should either provide a scaling bonus to other shapes (in essence giving a bonus to AC/TAC, attack, athletics and damage based on the difference between levels and allowing the wild shape druid to be functional from level 16 onward and not just for 1 min per day at level 20.
Fifth, there should be more than 2 items in the game for Wild Shaping druids. Right now there is a Gorget which doesn't really work since it is hard to include intimidate in the builds because of the need for Str, Con, Wisdom and Dex even though it is a signature skill and the druid's vestments which is very disappointing in its bad design. There should be a low level item to either address the magic attacks issue, unless the design is that Wild Shaping druids can't fight versus some monsters or included in one of the druid feats. This could also be an upgradable item allowing the druid to gradually overcome different DR types but offering no other mechanical benefit, cost similar to the magic weapon