This is no surprise, but the Guardians of the Galaxy are officially confirmed to be in Thor: Love and Thunder!
According to Comicbook.com, here is what Vin Diesel said:
The director talked to me about Thor will incorporate some of the Guardians of the Galaxy.
Also, here is what Diesel said when asked about Groot:
I only have two words about that character and it is ‘Alpha Groot.
I wonder how much involvement the Guardians will have in Thor: Love and Thunder. The Guardians and Thor are hilarious together, so I can’t wait to see their dynamic in the new film!