Depends if you are talking about "4G" or 4G. "4G" would be AT&T's BS'd version which is actually HSPA+ (in other words, a slightly enhanced HSPA [3G] network). That's probably what we will see the next round of iPhones. As for the real 4G, that won't come for a while, especially considering that AT&T has not even deployed that LTE network out there.
In real world usage, I wouldn't expect much from "4G" - HSPA+ just yet.
I think theres going to be a 64gb version. Just do a search and people are showing some 64gb proto types that say xxgb. Now i know a settings app can be recreated and installed on the phone without even going onto the app store so it could be a rumor and we wont know until release but i really think they will.
Sony slipped up and said apple has that factory witch has the cameras witch are 8 mega pixels.
Verizon slipped and said a global phone with makes me think it can work on any system.
Ether way we don't know for sure what it will have its all rumors until release but if this rumors are true i bet apple is getting pissed about this slip ups.