Very interesting interactions between the survivors on Argus and the arriving characters alright.
Just to put go into some of the story, Velen and the others land on a planet they end up calling Draenor 200 years before The First War takes place.
https://twitter.com/DaveKosak/status/410845546530615297The First War would have taken place roughly 43 years before what we are seeing currently, so it's entirely possible that the Draenei player characters may have be setting foot on Argus for the first time in their lives.
But even for those that are returning "home", considering what the few who did remain on Argus have had to endure to survive they may take some time to warm up to you.
I'd love to hear about your ideas on how to RP that though, as I'm sure others would too in both the
Role-Playing forums and the
Story forums :)