Lots of good info here :

https://steamcommunity.com/app/892970/allnews/

More here :

https://discord.com/channels/391142601740517377/463284222556241931

And finally :

https://www.reddit.com/r/valheim/

To summarize - Lots of bugs squashed early on, re-balancing of foods, stamina, and combat. New materials, new structure pieces, new foods, new armors, new enemies, new crops, saddle for lox, new crafting stations. All balanced (preliminary). New dungeons in mountains very soon. New biome in the works, due out sometime in the first half of 2022.