Well, to be honest, I am not up to date about posted ideas for upcoming Assassin's Creed Games. But a friend wanted me to post an idea which isn't bad:

Nothing super strange, but I think (in this combination) pretty new:

A weapon Editor for the melee weapons used by the portagonist - contains visual and performance aspects. Pretty similar to the system that already exists in Assassin's Creed Valhalla, but with the option to edit more details.
Imagine it like this: You [as a player] use the inventory or you have to go a weaponsmitch/ a weapon shop (depends on exact time period); you can modify your weapon (similar to fire arms in a few FPS today):

[Visual:] You can change the color of the metal, change the sword's pommel, add some details and effects (sound, grafic/sprites) and so on. (Nothing to crazy - don't risk to create accidently a "circus game").

[Performance:] You could add manually and detailed preformance/ strength points to a weapon. It depends on it's level and your character level how high you could go and maybe what special abilities/ spells you can use for a weapon.

[Name:] You can give your weapon a name - why not - makes it more personal. (Maybe no special symbols.)
Also there could be something like an online "swap meet", where you can share your modifications with others or give away your old weapons for in-game ressources or money. [No real money used here!]

[Microtransactions:] (Sry @those who realy hate this word - I know, but it is not the fact Microtransactions exist; it is the fact that it was abused so often to get your money while you just want to play a game ... ... For me, they are alright as long as these things are 100% optional! Means also: A game should include very cool e. g. weapons and it should be beatable without buying some Add-Ons or even ressources. Just bought the "Knight of the Round Table"-Pack ... one of my biggest bought. Just a few weapons before. Why? Because I like it's look. Nothing more, nothing less. And this is okay for me. It should stay this way ... at all costs! 🙂 )
Well:
Especially design and visual components could be sold in the Ubisoft-Shop. [What of course doesn't mean: Make things more expensive, just because you get only a pommel and not a whole sword for the same price! (Better not ... well ... just check what happended to "Dead or Alive 6") >;/ ]

I imagine it more like this: The items are as same as expensive as now for Assassin's Creed Valhalla (no wait - maybe a bit cheaper 🙂 ) - you buy a whole sword and then you can use it's visuals partly to modify your weapon.
Or: You buy a design pack: Means like 5 different materials for the blade, or 15 new symbols as decoration. Maybe even letters: So you can write something on the blade (?)

The idea doesn't have to contain all weapons in a game - some could be just standard (especially used by normal foes). You - as a player - could also use these weapons.
On the other side: Not only swords should be editable. Bows, axes, spears etc. could be to.

I think, the friend who gave me this idea is right: It is the next logical step, if the Assassin's Creed Franchise goes this - more RPG-like - path. But he also mentioned: What about a Spin-Off that contains all classic Assassin's Creed things? Smaller Map, Stealth, Templers and similar societies.

Well, also a Templer Spin-Off would be cool, too [my idea]: Needs a whole new gameplay - not much parkour ... more strategy and tactic.

I wish that they would make the Colorful Raven from the Ostra Festival available for all saves. Maybe put it in the Obisoft connect, they really should have put it in the spring pack instead of the parrot. It is by far the best looking raven yet.

Thank you Ubisoft for providing the Ostara Festival decorations.

Please could it be possible to optionally keep some of the decorations from the Ostara Festival and other Festivals in "Assassins Creed: Valhalla" as it is possible to do with standard decorations selected by the "Red Dragon" marker:

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The above picture shows the walkway in Ravensthorpe decorated with the Ostara Festival decorations.