"@ Tag I saw it in London with HH and see blew my socks off. I was thinking I have heard WH do all the song 1000's of times, how good could it be? It's different. The arrangements, the use of the songs. It all worked. I saw it in previews there, not sure how much has changed, but I am looking forward to this.
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The post-previews show with Heather and the OLC was more or less the same as the preview version you saw. Book/song/content wise, it remained the same (the only huge difference I noticed was the Frank/Tony scene about security). Otherwise, I think they used the previews to iron out technical elements rather than content elements.
A slight tweak in some scenes and dialogue happened when Beverley Knight took over, but also mainly on a technical front with the projections.
The tour version does have significant changes with new songs, some scenes being omitted and replaced and some characters completely removed (Frank's father and the older detective). I have a feeling that they will come back in the newer version that will run in the US. I feel that US productions have bigger capabilities and budgets than UK ones.