I've heard that there is still a lot of wishful thinking on this,... the talk has been consistent since 2007... Yes there has been more 'official' talk from the people who matter.. but nothing set in stone from station with regarding scripts, sets and contracts.
Its great all the actors want back.. but with areasonablesized cast they need a firm commit from the production to the show before they commit.. and then you have to get them all free to film as well..
Never-the-less i can't wait for moremisunderstandingsand social awkwardness... oh and bluemanshenanigans.