Do you guys think that Mewtwo raid will be available?

My money is on zapdos.

I think that Ho-Oh and Lugia will be available since they showed in the trailer. Maybe Mew and Mewtwo will come with the next bracket of legendaries when eggs rotate. Just a theory

Definitely the three birds.

Maybe Ho-Oh and Lugia too.

Mewtwo and Mew, perhaps but less likely.

Releasing Mewtwo would deliver on the original trailer video, minus the horde of people running for the raid.

Releasing the trio of birds would allow them to have some randomness in eggs like current raid bosses.

Maybe that's the mystery event ;)

To SNIP3 & Space Opera:
Mew and celebi have a history being promotional in both the Trading Card Game and the main series, I doubt we will see mew soon

I would agree very strongly that it will only be the 3 birds from Gen 1. If Mewtwo's stats were kept the same and handed out now it would imbalance the game, this and many other reasons why I think it will be a long time before we see Mewtwo.

I think someone in TSR found only the legendary birds (Only Lugia, Zapdos, Moltress and Articuno) in the game assets, nothing about Ho-Oh, Mew, Mewtwo, Celebi or the legendary beasts.

The video shows MewTwo getting away from Earth.