The news article/press release from BMW with regards the next generation MINI petrol engines can be found here:
http://www.mini2.com/news/news.php?id=130
As for the BMW K1200 motorcycle engine, I don't know where that information comes from, but I've not heard it before. I know they used a bike engine in the BMW Z13 project car, but that was a whole different design.
They said the K-Series doesn't fit, and worked on the new engine with Chrysler from early on.