rumor has it (from some sites and moles with 'good' track records... for whatever that's worth) that....
- the iphone5 will be a dual mode GSM/CDMA 'world' phone. apple will forego true 4G (LTE) and push 3G speeds with HSPA chipsets in the iphone5 because LTE chipsets won't be mature enough to meet apple's demanding requirements for low power consumption, low heat and small(er) form factors. apple will not produce phones that look like android phones (i.e. large, hot, bulky and relatively poor battery life)... and they will not be a guinea pig for immature LTE networks.the iphone5 will be a dual mode GSM/CDMA 'world' phone.
HSPA speeds will approach those of LTE anyway, so no biggee there. remember, the first iphone wasn't 3G even though 3G existed because apple was unwilling to 'experiment' with new networks.
- the iphone5 will likely have a dual-core processor and be more than 'an iphone4 with a better antenna'... although you can
count on a 'different' antenna.
- Verizon will skip 'interim' speed technologies to go right to LTE... in fact they're already rolling out their LTE network. problem with this is, that when you are in a city without LTE service (expect 'full' coverage on Verizon and AT&T around 2013) and you're on the Verizon network, your speed is going to roll back to 'basic' 3G (EV-DO). AT&T by contrast will support HSPA and interim speed upgrades on their way to LTE, so 'rollback' speeds in cities without full LTE will be 'near LTE' on the AT&T network.
- sorry to break it to all the Verizon fans, but despite all of the bitching and moaning about AT&T's network, it is now head and shoulders above all the other networks in speed and reliability, including Verizon (http://www.pcworld.com/zoom?id=189592&page=1&zoomIdx=2
). defectors to the Verizon network will further speed up AT&T's network.
the above issues are likely more important in helping you decide to wait on the iphone5 versus switching your current phone to iphone4 while on Verizon... or maybe even considering a switch to AT&T. The internet is full of stories about AT&T letting current customers revert to unlimited data plans after threatening to switch to Verizon. I suspect AT&T will also start offering unlimited plans to Verizon customers who commit to switch.