What are the key changes to Assault Marines in the 8th edition of Warhammer 40,000?

In the 8th edition of Warhammer 40,000, Assault Marines saw changes to their rules and abilities. They gained the ability to Deep Strike, allowing them to arrive on the battlefield from reserve. They also received a new rule called Shock Assault, which gives them bonus attacks in the Fight phase. Additionally, their Jump Packs now allow them to move over models and terrain more easily.