Amid speculations on tomorrow's Senate hearing where Joey de Venecia may finally reveal the "Mystery Man", (e.g. here and here), it is reported that Mike Arroyo has "flown to coop". Of course the proper attitude to take in these moments of great expectations is to hope for the best, but expect the worse.
Update Sept-18-2007 12:48pm: Mike Arroyo is the 'Mystery Man'. For those interested in near real-time updates, there is liveblogging over at mlq3's.