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Variety
I think that a sequel to far cry primal should feature not just the beasts from before but many more new ones and also tons of dinosaurs to tame and ride, whether carnivorous Giants and herbivores everything that isn't human could be tamed and again be your transportation as well as a deadly companion. Who needs a truck when you're riding a pet tyrannosaurs Rex who will attack on command, or a triceratops and stegasourus who can be ordered to attack using their spikes to impale the enemy and stampede trampling them.
Even a long necked brontosaurus, brachiosaurus or diplodocus will help you reach areas high up by lifting you on their necks acting like ladders. The dinosaurs and animals will be handy in helping knock over trees and stack logs to be used to build walls and shelter for your tribe which can be secured with vines, turned into firewood or piled up as traps on hills and the same will apply to boulders which could be triggered with landslides and levers crushing enemies in their path.
a 3rd person perspective and allow you to command members of a tribe such as a medicine man who will heal you and your friends using a vast array of basic things foraged from the environment such as honey to act as ointment to heal burns, suturing cuts and applying disinfectant to prevent swellings from impeding progress.
Also as your team forages for ammunition, they'll discover an early form of explosive powder similar to gunpowder that can be used to make explosive arrows ignited using Flint. Once tagged either via an animal friend from the air like one of many birds of prey or pterodactyls, pteranodons and other winged dinosaurs or via your teammates, or yourself with an early form of the telescope, you can opt for an the bird to swoop down and attack with their talons and beaks, or in some instances carrying off screaming enemies. Alternatively animals on the ground could once again attack enemies on their own charging in aggressively or be commanded to use stealth with stalking attacks sneaking up before pouncing from anywhere. Alternatively your cavemen allies could do the same quietly sneaking up and taking them out silently or could charge with their spears, shields, axes and clubs. Try and add more variety of weapons that are similar to assassins creed 3 as minus the muskets weapons would have been fairly similar so their would be bows with reinforced limbs made from bone and wood, staffs, spiked and ball headed war clubs, shields with and without spikes to clobber enemies.
Even the most dangerous predators like sharks and piranhas will become tame friends who will lurk where the enemies are swimming and attack using stealth ambushes when commanded.
Insects like spiders and scorpions can even become loyal pets waiting to be ordered to attack enemies in caves and any venomous animal will become man's best friend able to lend its potent neurotoxins to help either by attacking enemies or lending it's supply to vary the types of poisons available.
New aquatic pets will be the Portuguese man O war and box jellyfish capable of delivering a sting so powerful that enemies will die screaming unable to breathe. While the ambush predators like crocodiles and giant pythons or anacondas in jungles and swamps will gladly become pets waiting beneath the water and in trees to strike dragging enemies underwater and suffocating them in their bone crushing coils with lightning speed.
Talk to survival experts and archaeologists will help you find a vast array of ideas for new weapons, dinosaurs and animals, environments and ways to use the environment and hunter vision to locate animals underground in that enemies can fall into the path of by falling down holes.
Parkour and a cover system could be better than ever as players can leap between trees, grappling across ledges and hiding behind cover to launch sync kills ghost recon style with teammates.