name='Steve Crook']Yes, lots. They went all the way back to the original three strip Technicolor negatives (not just the interneg) and re-aligned them with each other and with the soundtrack. Then they took it all the way forwards through the whole process to make the new print. They digitised it at incredibly high resolution to help with things like scratches. They spent about 6 years on it and it cost them a few million to do.
And it's well worth it. I've seen the nitrate print from the (American) Academy archive, that was very impressive. This is better. It's very sharp and clear, very clean and bright. The colours glow. But I loved that they deliberately didn't try to "improve" any of the mistakes or things where the original film was limited by the technology of the time. Like the cut as Vicky runs down the spiral staircase or the "smudges" on the masking when she starts to float through the air in the ballet. It would have been so easy to tidy those up with modern technology, but I'm so glad that they didn't.
It's being shown at Edinburgh International Film Festival
on 18 June and at UCLA's Billy Wilder Theater
on 31 July - 2 August and will doubtless be shown at lots of other festivals and big cinemas. It's also going to be released on DVD and on Blu-Ray but it's best to see it on the big screen if at all possible