I'm assuming Valkyrie is dead and I'm kind of bummed about that. It's like the start of Alien 3 where you learn all that effort from Aliens was for nothing. Thanos wipes out half of civilization, but it seems he's destroyed all but one Asgardian. I wonder if there was a deleted scene where Thanos let Valkyrie escape with half of the people. Maybe when they filmed this they weren't sure how popular the new characters from Ragnarok would be, but they seemed very confident about the Black Panther cast.
Thor mentions that half of the Asgardian's escaped so she's presumably with them.
When does he say this? If they're alive, couldn't they have helped him while he was floating in space?
I forget exactly. He says it to either Groot during their alone time or before the other Guardians leave. My guess is they evacuated to safety beforehand and didn't know what the aftermath was.
He does say something but I think it's more along the lines of "Thanos slaughtered half my people," so there's a strong possibility Valkyrie is alive, but I would love to see how she ended up on an escape ship and not fighting Thanos or his minions.
Another thought I had watching the film again today...
When Bucky dies, his arm turns to dust too. Wouldn't it fall to the ground separated from the body that turns to ash? Of course then I'm questioning all the clothes and capes and suits that also dust, but it would've been interesting for Bucky's arm to remain because Rocket lives and he said he was going to get the arm. This would give it to him but in an unfunny way.