The SG4 or moreso how they will do the next model of the SG3. The Sg3 has become a recognizeable design so to stray from that would be a mistake since this phone has taken off so well.
The Blackberry z10 looks pretty sweet. If I were to leave the android army, it would be for the BB Z10. I am interested in the SG4 and whatever Google/Moto comes up with. Obviously the next Nexus will be 2g or something less than acceptable like the 4 was.
2 people have already said it; I'm also looking forward to the Moto X/ Nexus 5/ Note 3. I'm guessing the large dev community for the Galaxy Nexus will all jump ship to one of these phones as well, so I'll probably buy whichever phone that may be.
Galaxy S4 hands down...this is the only phone that will matter this summer, huge media blitz, record sales, etc, etc, etc, Samsung will be riding high on this baby.....I cun't wait