The Samantha scene has always confirmed to be a phone call, but I suspect the series will end with her saying “Honey, book a table for 4 I’m coming home” and then it will set it up nicely for series 3, the crew will beg Kim Cattrall to come back and she won’t. So then the start of season 3 will be something about Samantha dying in a plane crash lol!
Kim did say the one scene she filmed was all she would do and that’s it however, she did say she’d never do a return as Sam and then agreed to do a scene so you never know. She could film a few scenes for next series (if there is one) which are just phonecalls. Something is better than nothing I guess.
I’d love Sam to come back but they’d probably butcher her character too.