https://nintendoeverything.com/xenoblade-chronicles-definitive-edition-details-improvements-to-quests-colony-6-more/
– Quests: the Quest screen has been revamped, and information is presented in a clearer way
– If you set a Quest as Active Quest, then you will be guided to your destination
– You can even enlarge the map to know exactly where you’re supposed to go
– The Colony 6 reconstruction quest has been made more convenient
– Can check how much money and what kind of materials you need for reconstruction straight from the Menu screen
– Affinity Chart: you can check it out from the Menu screen
– You can find details about the various people you’ve met during your journey
– Those details are recorded in their Profile, which lists things such as the hours they are active, the places they can be found at, items you can trade with them, and more
– Equipment: this version of the game introduces a feature from Xenoblade Chronicles X: Fashion Gear
– Choose what your characters look like at all times
If you set some equipment as Fashion Gear, then your character will always be wearing it in battle, when exploring, etc.
– However, you will keep the stats of the “main” equipment
– No more having to choose between style and good stats
Future Connected Details:
https://nintendoeverything.com/xenoblade-chronicles-definitive-edition-future-connected-details-and-screenshots/
– 1 year after the last battle
– The world is at peace, all the different races are working together, restoration was proceeding
– Shulk suggests to Melia that they look for Alcamoth, the imperial capital
– The two of them hopped aboard the Machina ship Junks
– As they searched for the capital, they were welcomed by a surprised attack
– The place where Junks fell called “The Bionis Shoulder”
– Bionis Shoulder never seen in the main story
– In the area of the Bionis’ left shoulder, a strange mineral is making landmasses start to float
– The members of the Nopon race “Kino” and “Nene” will be joining you
– They’re still young but their fighting capabilities will put even adults to shame
– Kino: Striving to become a hero for the sake of his father, weary of strangers
– Nene: Kino’s adoptive mother; may look cute but she’s one mighty fighter
– Just like in the main game, many different formidable foes will be waiting for Shulk and friends
– Since Shulk has lost his ability to see the future they’ll have to be more careful than ever during battles
– New enemy “The Fog Beasts”
– The new monsters shrouded in a dark mist are called “Fog Beasts”
– They’re not just powerful opponents, their emitted waves pull other enemies towards them and they’ll cause them to attack Shulk and the party
– Scattered throughout the Bionis shoulder are a team of registered surveyors, the Nopon-rangers (Nopongers)
– By befriending them and fulfilling their request, they’ll assist you with their own signature skills, aid Shulk and company or use a powerful attack
Not mentioned here but it's confirmed FC like the Torna DLC will have a significant change in its combat system from the main game but it's not been detailed yet.