Isaac, 35, will have a role in JJ Abrams's highly-anticipated sequel alongside original trilogy stars Harrison Ford, Carrie Fisher and Mark Hamill, reported Entertainment Weekly.
"They're such funny people. Carrie is hilarious and doing such cool work. Harrison is back. He went on hiatus for a little while, but he's 150 per cent back. It's pretty amazing to see him bounce back. He looks incredible," Isaac said.
"Everyone's having a really good time. JJ sets that tone. There's a lot of enthusiasm and it's being done with a lot of heart. There's nothing cynical about the way we're doing this.
Isaac is joined in the main cast by John Boyega, Daisy Ridley, Adam Driver, Domhnall Gleeson, Lupita Nyong'o, Gwendoline Christie and Andy Serkis.
'Star Wars Episode VII' opens on December 18, 2015.