Saw it on Friday. Loved loved loved it!
I think Loki and Heimdall are definitely dead, Gamora will be back due to some soul stone trickery, and the jury is out on Vision. I thought he was a goner, but a pp's theory that Shuri downloaded him is very plausible. All the ones that dusted will be back.
It is a testament to my devotion to Cap that even the beard didn't put me off (I heart Chris Evans), and I loved his entrance at Waverley Station. But Thor just owned the whole film - the comedy with the Guardians, the emotional response to everything he's lost, holding open the forge for (not) Peter Dinklage, and an even better entrance than Cap when he arrived on Wakanda. And he's still got the enormously hot new haircut
Overall, I was really impressed with how coherent the whole thing was with such a huge cast and so many disparate plot points. I can't wait to see it again - though we'll have to wait for the Blu-ray release now.