In dollar terms, Trolltech in 2007 was doing $30m Rev and making $8m profit. Obviously that's 5 years ago and I don't know what the current fundamentals are, but it would be interesting to know if that business within Nokia was doing more revenue or less, and what it's costs were.
If I were a former TrollTech employee, I would suggest taking a leaf out of Xamarin's book: http://gigaom.com/2011/12/12/xamarin-mono/