Black Label Society and Obituary tour announced, then canceled

Within the past hour Black Label Society announced a two-week North American tour with Obituary and Lord Dying that was to commence in early December. Strangely, within an hour or so of the announcement, the "North American Crusade" seems to have been abruptly canceled. Lord Dying posted the dates on Facebook, then amended their post with the following update: "Unfortunately, due to unforeseen sudden circumstances beyond our control, this tour is no longer happening." Uh, ok.