Samsung's statement on the postponement reads (via BoyGeniusReport):
Samsung and Google have decided to postpone the Samsung Mobile Unpacked event during the CTIA in San Diego, previously scheduled for Oct. 11. Under the current circumstances, both parties have agreed that this is not the appropriate time for the announcement of a new product. We would ask for the understanding of our clients and media for any inconvenience caused. We will announce a new date and venue in due course.
Much of the anticipation over the event was over the phone's use of the new Android release, Ice Cream Sandwich. For now you will have to satisfy your curiosity with screenshots which have already been leaked.