4:04pm: Ken Rosenthal of FOX Sports tweets that the conference call has been moved up to tonight, and that The Big Unit will indeed announce his retirement.
2:47pm: According to Bob Nightengale of USA Today (via Twitter), it appears that Randy Johnson will announce his retirement tomorrow morning. A bunch of other reporters are talking about tomorrow's poorly-timed conference call as well.
Johnson would finish with five Cy Young awards, 303 wins, 4,875 strikeouts, and a 3.29 ERA in 4,135.3 career innings. Baseball-Reference puts his career earnings at $175.55MM.