I just saw this on their website.  http://www.toto99.com

David Paich to miss summer tour — 10 June 2003
David Paich will not be able take part in TOTO's summer tour! TOTO guitarist and founder Steve Lukather explains the exact reasons in the follwing band statement:
"David will be missing the summer tour due to a sex change operation. His dreams of becoming who he REALLY is, a woman, need to be realized. The lie he has been living has been difficult for his family and for us as a band. It will be our pleasure to intruduce "Davida" in the Fall. This has been a long time coming and we wish him a quick healthy recovery. We are pleased to announce that Greg Phillinganes, most notable of the Eric Clapton band, will be joining Luke, Mike, Simon and Bobby for the tour. TOTO".

Wow, this guy (gal) really has (had) some balls to make this kind of announcement.