I'll keep it to the point

The Map

-Keep all areas from the witcher 3

-Update them with new textures and folliage

-Add two more areas and connect on the parts into one super map

-Maybe add a volcanic area and a desert to add more variety.

Enemies

-More variety

-Keep old ones and well as new ones

-More inteligent AI

-More enemies on screen at once

Gameplay

-Add two new spells and keep old ones

-Base game is as long as the witcher 3 + expansions

-More puzzles

-more minigames fishing/hunting/etc.

-keep gwent

-Add co-op similar to fable?

-More abilities/mutations/armor

-Be able to customize own character this time instead of playing as Geralt (as much as we love Geralt)

-Have some sort of hidden collectables to find (other than gwent cards), have to find rare coins and make a collection of them throughout the world?

-More items to create

-More uses for money

-Silver coins/gold coins/ copper coins

-Be able to make a house from the start

Menus

-Menu that loads quickly

-Larger font

Graphics

Xbox Scorpio 60fps/4k HDR

PS4 Pro 60fps/1080p HDR

The witcher 3 (and its expansions) are by far the best games to release this gen of consoles. The witcher 4 could play it safe and add the above and be extremely successful.

My only wish:

Make good combat for once

why would you want so much of the map to be basically the same? Is the world limited because of the books?

My wishlist is actually quite small: 

- New map. Equal or bigger in size to Witcher 3. 
- Same or similar combat system as Witcher 3. I think that system is fantastic, fits the game. Perhaps with better skill customization and camera management and it would be perfect. 
- More variety in enemies. Perhaps a Dragon or two. Dont be afraid to have bigger foes. 
- Better quest management. I hated Witcher 3's quest menu. And better item management. I hated Witcher 3's item menu. 

There's not going to be a The Witcher 4, at least not anytime soon.

CD Projekt RED is busy making Cyberpunk 2077.

I'm probably the only one but I prefer witcher 2 / risen over witcher 3. 3 feels too much like every other open world game. I want a smaller more linear map like dark souls. in which you actually explore every corner, master any monster instead of running a checklist of copy pasted marker where you can just charge / ignore every monster on the way.

My wishlist - no Witcher 4. TW2 game structure is, IMO, much better suited for more story focused game then TW3 was, yet I want to see CDPR do proper open-world fantasy RPG, and that means no fixed main character.