According to a review of the handset conducted by AnandTech, it was discovered that the kernel found on the Google Edition Galaxy S4 is by Samsung, versus Nexus devices whose kernel is from Google. What this means is that while you probably will get updates a lot earlier than regular Galaxy S4 owners, the updates might not come from Google directly, but from Samsung, and because of that it could be a few days after the official release. The exact time frame is hard to say at this point in time, and for all we know Samsung and Google have worked out some sort of deal that would allow updates to be pushed on the same day, but it’s definitely worth keeping in mind when trying to make up your mind.