Dan could well be right that another BD/MK tour will not happen.
All that was indicated, by several sources, is that, last November, the two of them had wished to do so and that, in effect, both had pencilled time aside in their diaries in the year ahead. Bearing in mind Dylan's past touring patterns, this pointed to a month or two ahead of Thanksgiving 2012. Logic suggested that this would be in North America. However, back last Novemeber, nothing would have been firmed up and, for both these jolly chappies, nothing is set in stone until it's set in stone.
With what we know of Dylan's future touring plans (South and Central America in April/May and a "festivals plus" series of shows in Europe from late June into July), a joint BD/MK tour later in the year is still a possibilty. He has no American dates announced for 2012 this year at all, so a tour there is a distinct possibility. As for Mr K, we only know that "plans are afoot" not what those plans might be.
I still lean towards a joint BD/MK tour of North America in October and November but nothing is certain and, as they say, it takes two to tango.