After some painstaking image manipulation Crunchgear has deciphered the text about iChat:
The Windows stuff is a footnote. And whats it a footnote to? Look at the images above.
Its talking about iChat, and says Now available for iPhone and Windows, with a footnote that says Windows XP SP2 (or higher) or Windows Vista required.
To me, its not saying you need windows to have video chat with an iPhone, it means youll need those versions of Windows for the new version of iChat Apple is going to release for PC.