I was just reading an interview with producer Frank Marshall on the BBC website and he talkied a bit about Indy 4:
"You have made a habit of working with the best in the industry, such as Steven Spielberg on the Indiana Jones films?
Yes and Robert Zemeckis on Roger Rabbit and Back To The Future. Those were certainly fun adventure stories. I have a vivid imagination and I love fantasy and adventure.
Are you looking forward to re-teaming with Steven on Indiana Jones 4?
Oh absolutely. It's one of the reasons we're going to make the movie. We sort of rode off into the sunset after the third one and then were all at this AFI tribute to Harrison. We were backstage - George, Steven, Harrison and I - and we said: "That was really fun. We should do that again." As you go on in your career things get more serious and you tend to miss your frienRAB. But we just had such a great time on those movies that we thought we'd see if we could come up with a story that was worthy for a film. We're getting close now so it's really an enjoyable experience for us all to be together again.
Have you got a start date for filming?
Not really but we're trying to get our schedules right and finish the script. I would say it would be some time next year, 2007. Obviously, we want to get it right. There's no reason to do it unless it's going to be great."