This week Tour looks into what used to be the Articles section and is now called Novelties.
Origins of the calibre 5000 family
https://www.iwc.com/member/forum/specials_detail-en.asp?ID=64&year=2005
At the end of the article it refers to the next chapter, but I am unaware of a follow-up article. Some further detail can be found in Watch International #1/2000 and in Michaels report on the calibre 5011.
IWC's new calibre 5011
https://www.iwc.com/member/forum/specials_detail-en.asp?ID=33&year=2005
Cheers from the cellar.
PS Hopefully the archive search function will allow us to see the complete thread rather than a single post by next Tuesdays Tour.