I missed that but, as it would not seem sensible for MK and BD to tour Europe together so soon after the 2011 shows, I guess Guy is not really giving too much away.
Part of Guy's problem is that, until a tour is contractually signed, sealed and delivered, anything could still change. On a personal level, he would not wish to lead his readers astray. On an organisational level, the PR people are likely to object to any premature revelation, as they would seek to make an announcement with a flourish. Finally, it is common practice, for longish tours anyway, that more than one itinerary is developed. I assume that this avoids the "all the eggs in one basket" syndrome and allows artist management greater flexibility in their dealings with local promoters. This means that information about particular dates/cities/venues may be given in good faith but not be accurate in the end. Also, Dylan has been known to seek to avoid playing all the same cities and/or venues as on previous tours.