Prior to the Battle of Umbara, Jedi General Pong Krell had visions of Order 66, the Great Jedi Purge, and the rise of the Galactic Empire. Subsequently falling to the dark side, Krell used his visions as justification for attempting to sabotage the battle so he could become Dooku's new apprentice.
In Legends, the Jedi knew about Order 66. They just didn't know it could be used in the way it was. It was billed to be used for taking down dark Jedi or rogues. Even before the biochip thing, the clones were flash trained with the expanded meaning of the order, which the Jedi were unaware of.
Prime Minister of Kamino Lama Su and chief scientist Nala Se obviously knew of Order 66 and the fact it needed to remain hidden from the Jedi, so they were in on the conspiracy on some level.
This makes it clear that the clones were always aware of Order 66, if only subconsciously. Without knowing what it truly meant, the clones always knew that Order 66 was a part of their creation and that it was always going to happen, yet could not do anything to stop it.
Order 65 stated that if a majority of the Senate or the Security Council declared that the Supreme Chancellor—at that time Palpatine—was unfit for duty, the Chancellor was to be arrested or, if necessary, killed.
So, it's likely Yoda didn't want to interfere and alter the future, as he'd be at risk of preventing the Sith from being defeated many years later. While Yoda sensed that the Sith's plan involved the Clones, it was too late to prevent Order 66.
What we do know is he knew that the clone wars would happen, he says that in the clone wars. This means that he most probably knew about the clones and order 66. He doesn't know about anikin until about a week before order 66.
Vader did not hunt for Yoda in any cinematic depiction. He and Sidious could not find Yoda as he had exiled himself on the planet Dagobah which had strong dark side energy that masked Yoda's presence in the Force.
Nearly all the surviving Jedi Knights were hunted down and killed by Darth Vader, while Order 66 remained in effect indefinitely among the ranks of the Galactic Empire's newly christened stormtroopers.
The First Order is a fictional military movement and rump state in the Star Wars franchise, introduced in the 2015 film The Force Awakens. It is formed following the fall of the Galactic Empire after the events of Return of the Jedi (1983).
Order 99 was an order arranged by Jedi Master CaptainR1. It turned the storm troopers back to side of the new Republic. During the clone wars, clone commando "Roger" refused Order 66. He was very close to the Jedi he was fighting with.
Star Wars: Tales of the Empire added three new Jedi to the list of those who survived Order 66: Barriss Offee, Lyn Rakish (the Fourth Sister) and an unidentified human Jedi. The unidentified human had never been seen before in Star Wars, and they made their debut in Tales of the Empire.
Look, he definitely isn't Mace Windu's son: the age doesn't match, considering the other character's ages (Luke, Leia, Vader, Solo, etc.). However, i think it's possible to see Finn as his grandson, but for that you must consider that Windu had a secret baby close to his time of death.
Just as Snoke suggested it in Star Wars: The Last Jedi, Rey's force abilities were a response to Kylo's skills, which meant they could eventually become equal in power.
Although Star Wars: The Rise of Skywalker concludes with Rey choosing the name of Skywalker and completing her path to becoming a Jedi, it's possible that she was actually the reincarnation of Anakin all along.
As both a Sith and the ruler of the Empire, Palpatine took advantage of his clone resources by indoctrinating them with an order to kill Vader. Order 151 is also a credit to the incredible fighting prowess of Clone Troopers, even with their free will removed.
The Clone Wars Would Have Entered A New Phase If Order 66 Failed. Instead of fighting droids, the clone army would be repurposed to fight Jedi. On the bright side, this would mean the clones wouldn't be cast aside as they are after Revenge of the Sith.
Order 33: Kill half the Jedi. Order 34: Start planning for Death Star 3. Order 35: Keep those meddling kids away from Anakin. Order 36: Clean Palpatine's office. Remove sliced appendages.
