Does anyone remember a few months back, apple filed that patent about the new "locked screen"?
If they implement push notifactions, obv there are going to be more notifications, so the "locked screen" would start to get crammped, i.e. with text messages, missed calls, voice messages, IM's etc.
If I remember rightly, the plan was to give the "locked screen" some sort interactivity, so you can select on of the notifications and go straight to that app, i.e. an IM, text etc. obv after unlocking it.
That could be part of the update to the OS, that'd be pretty major and warrant the 3.0 status (along with push).
Just a thought