Here's an interesting article from the UK's Personnel Today, discussing how corporate America is ahead of the curve on the country's "cultural clashes," including gender identity and sexual orientation.
The article includes quotes from Raytheon's chief diversity officer, Hayward Bell, and American Express HR public affairs manager Bet Franzone, indicating that these are corporate image tools. I made this same point in my 2003 dissertation: while corporate America of course has concern for all employees, transgender workplace diversity policies are a simple way to demonstrate diversity leadership. What actually happens when transgender employees transition on the job, however, may be another matter. Companies should make sure that their gender transition policies match their EEO policies to ensure that there's no major discrepancy between them.