If you go on Play Store today you will be able to buy the Samsung and Google powered Galaxy S4. The device running stock Android 4.2.2 currently seems like the best option for a new smartphone, of course if you can afford the price (which is $649 for a 16GB Galaxy S4).
The device is actually officially called 'Galaxy S4 Google Play Edition'. It is very exciting to see that manufacturers have embraced the idea of launching devices with fully 'Nexus' experience, which is basically the purest Android version. The entire Nexus line really impressed, especially because any device running stock Android gets updates first. This is one of the biggest advantage, in my opinion.
Because the 'Google Play' Galaxy S4 now runs on Android's purest system, it will not benefit from Samsung's own software. Although some may call that bloatware, there are still features that can be missed.
There is one problem though, and that;s the fact that this version is only available in the United States. Also today the HTC One Google Play Edition was also released. It seems that Google focused on the top 2 devices on the market at the moment to promote their pure Android experience. If you live in the US, access Google Play Store and take a look at the S4 Google Play Edition.