Here's a list of what we know and what are rumored:
Fact:
--cut and paste
--App multi player support through bluetooth
--Spotlight into iPhone makes searching cross apps and virtually everything in your phone.
--Search is everywhere, now type in search area for almost apple app in your phone such as iPod mode, notes and more.
--Your landscape keyboard will now appear in almost every apple app including text messaging, notes and mail.
--Pictures can be sent and received through mms.
--you can eMail more than one pictures now through mail
--Push notification will make others apps capable of notifying you of any changes in information they provide. such an example is myspace messages will now show up as unread eMail or text messages next to their icons.
-- New types of applications made by a third party device will now have integrated apps within them. An example of this would be something like a stereo with an iPhone dock will now have an application built in to control the stereo it self.
-- Triangulation technology allows for the iPhone to determine which direction it is facing, so maps such as google maps can now have turn by turn directions, though it may take up allot of battery power.
Rumors:
--Video
--Video upload
--Video Edit
Here's the YouTube App:
-Sign in
-subscribe
-Rate
-post video (rumor)