Hemsworth and Holland haven't appeared in an MCU movie together yet. Although they will at some point. I was giving examples of actors who appeared in a movie together before both appearing in the same MCU movie. If we're going to include actors who've worked together before appearing in any MCU movie, the list gets very long.

Chris Hemsworth and Tom Holland

Robert Downey, Jr. and Marissa Tomei
Anthony Mackie and Jeremy Renner
Anthony Mackie and Chris Evans
Chris Evans and Scarlett Johansson
Benedict Cumberbatch and Karl Urban
Idris Elba and Karl Urban
Cate Blanchett and Karl Urban
That's just a quick list of actors who've worked together before appearing in the same MCU movie.
Not that interesting.

It will also be an Avengers reunion, both Chris Hemsworth, Tom Hiddleston and Mark Ruffalo were in that together.

It would also be a little Life Aquatic Reunion as well (Goldblum and Blanchett both starred in Life Aquatic)

We already saw Howard the Duck, so that wouldn't be too crazy.

I wouldn't mind seeing Devil Dinosaur (And Moon Boy or Moon Girl).
Chuck Norris threw a grenade and killed 50 people, then it exploded.

I really don't mind dinosaurs in marvel cinematic at this point all these good actors will just make it believabe. RDJ, Chris evan, benediction cumberbatch. Now with goldblum in thor!

Yeah, it's really awesome and incredible that these two actors that was in that one movie together 25 years ago is in the same movie once again. That must mean they are adding dinosaurs to the MCU!

He said he only filmed for 3 days so, it's got to bee a minor role if not one line of dialog. Possibly a post credit scene.

If it's not too obvious, there should be a Jurassic Park like dialogue between the two.
07/08/06 786 the sentinel of Allah has arrived.

I think there is actually a chance he is playing an older Warlock, who gets reborn, and a younger actor returns to play him later.

Voicing or Motion Capturing? One requires you to be on a set, the other just requires you to be in a studio.

Then stop hoping and you won't be disappointed as much.
You people who get "disappointed" over whiney crap really crack me up.

That's what I hope but I've been disappointed before.
Whatever you are, be a good one.

He could be voicing Surtur.
"Never rub another man's rhubarb"
The Joker, Batman

I wanna know who Sam Neill is playing!?!? Probably some minor league throwaway role. sigh
Whatever you are, be a good one.