It does mention the calendar and contact synching, however, their web site does not show the iPhone as supported and their marketing content is rather vague. surprise, surprise... I'm also looking at Visto to see what they do in the next few weeks.

"The result was that huge numbers of comparatively dumb cell phones (sometimes called ‘feature phones’), which ship with simple e-mail clients based on these standards, could now send and receive e-mail, via the Gateway, to corporate e-mail servers or to Internet mail services offered by AOL, Google, MSN, Yahoo and others. And via SyncML, these users could synchronize calendar and contact information with these same back ends. "