Perhaps it is a simple dose of reality that is slowing down (if that is, indeed, what's happening) the rush to canonize Pope John Paul II. Certainly a pontificate a quarter century long would produce a great deal to investigate. According to reports from Catholicculture.org, and NCRonline the immediate cause of the slowdown is the revelation of extensive correspondence with Wanda Poltawska, described as a long-time friend and adviser to the pope.
Reports Catholicculture.org: "Pope John Paul II's closest aide is strongly criticizing Dr. Wanda Poltawska over her decision to publish five decades' worth of private correspondence with the late Pontiff. Cardinal Stanislaw Dziwisz of Krakow says that Dr. Poltawska -- a psychiatrist and concentration camp survivor-- is claiming "a special relationship where none existed" and that many others corresponded privately with Pope John Paul.