Samsung’s chips that use ARM’s Cortex A15 processors have a model number that begins with “5”. The $250 Samsung Chromebook uses the Exynos 5250. The $399 Samsung Nexus 10 uses the same chip. The Galaxy S4, depending on the country you’re in, has the Exynos 5410.
According to the Japanese site Ringer’s Blue Men, a new Exynos called the 5420 exists. Their evidence is a link to a patch request for the Linux kernel. But if you do a Google search for “Exynos5420”, you’ll see it shows up in a ton of other similar patch requests.
From the tens of minutes I’ve spent reading several of these requests, it looks like the 5420 might show up in a new Chromebook, though I have no clue if it’s a high end Chromebook or simply a refreshed version of the Chromebook that’s already out on the market. The Exynos 5420 has a new “DWMMC controller”, though I have no idea what that means.
Apologies for being light on details, but Samsung’s chips are something I keep a close eye on since they’ve typically been used in high end products. It’s weird, to me at least, that most GS4 units sold have a Qualcomm chip inside, and we’ll likely see the same story with the Note III. This is unprecedented in Samsung’s history.