1script - 1:12 am on Jun 27, 2010 (gmt 0)
So, in summary, it's not really the template they changed but the content itself. I guess, it's reasonable enough to draw a line between on-page factors such as layout, h1, title, metas and such and the content itself. I'm not sure if we call content an on-page factor. Do we? In my mind content is THE page itself. Or, rather a combination of content and its URL is what absolutely defines the page. Everything else appears to be secondary to those two.
So, I guess, it's not really that strange that they dropped so hard - they completely changed the content.
Bottom line - if you have something new to say, create a new page. Case study written? ;)