To soon to tell, But since the Rezound went through the FCC again they could have changed the processor/gpu on it. It could have the S4 8960(which can be clocked to 2.3ghz no problem) with an adreno 225 in it . Which would destroy anything out on the market right now and improve battery life(including the iphone 4s....just just barely gpu wise though).
Qualcomm did say they expect to have a phone out with this processor 4Q 2011(and they are partners with HTC).
If not the rezound, expect a beast of a sensation coming out!!!
Camera wise....putting in the BSI sensors are a good start, but getting a faster lens and better high ISO would be great(for low light). Increasing the dynamic range would be nice as well. Also note all of these cameras have fixed lenses(mostly 28mm equiv.). So a short zoom lens will be coming soon enough.
Take a look at some of the phones they have in japan. TONS of waterproof phones with zoom lens cameras and ...yea...nice phones!
The Rezound went back through the FCC to have their wireless induction charging back plate tested.
Nothing was added.
As for quad cores, if you know anything about CPU's and I think you do, you'll agree that it will not benefit phones for quite some time.
We're barely utilizing dual cores and the best thing for these companies to do is reduce the die size of the cores, so that we're using less power at higher clocks.