Good points Heks, but I think the only way I would agree is if they went to the warehouse for the Ark for some reason. As it is now, the only real link would be the warehouse and it is already clearly extablished that the warehouse is the same from Raiders. Now, focusing more in Indy and Marion in that opening B&W bit makes sense since the movie deals with their relationship.
Just my opinion.
I had a little idea for an edit of Indy 4 that I'll probably not do now that at least 3 indy4 edits are on the making.
What about replacing the picture of Sean Connery that Indy look at by a picture of Marion? I don't know if it would make sens with the dialogue that come right after that though.