It's a shot of Bespin where the wall has been opened up to show a view outside and even a moving elevator.
(When you look at it on the 2004 dvd; you go : "Wow, nice job".)
Our heroes then proceed to a door where Lando reveals Vader to them, who disarms Solo. Then Boba Fett shows up.
The shot ends with stormtroopers showing up behind Solo, Leia, et al.
Behind the stormtroopers you can see the previously opened-up wall to have reversed to it's previous O-OT status.
(Then you go : "WTF, what were they thinking - that we got five second memories or what...")