Evo 4G LTE will be the best android phone on Sprint for some time. It's basically One X with Tegra3 swapped with Krait S4/LTE chip. S4 is the latest generation of Qualcomm processor, integrated LTE radio based on 28nm chip process, which makes chips in Rezound the last generation. It will be monster phone on verizon, but unfortunately Sprint LTE network is nowhere near to take full advantage of this phone.
It seems Samsung is close to announcing their flagship GSIII with new Exynos, HD SAMOLED+ in a few months. I think battle for android king will be mainly between HTC and Samsung, and Motorola seems falling behind a bit. But verizon won't get phones like this until late Q3 at the earliest.