It's too early for WP announcements yet. They will talk about it for sure like they mention it on the event site. Maybe announce some services for it but hardware, i very much doubt it.

My pure guess is more than one Symbian device and RM-680, maybe consumer device announced in Nokia Connection. Don't belive for WP or these "super S40" phones being announced. There's still Nokia World in October that got perfect timing for some big WP announcements.