Samsung Galaxy S4
Samsung Galaxy S4 is the Korean maker's next flagship device and it will compete directly with the iPhone 5 and other high-end devices. It should feature a quad-core Exynos CPU, 2GB of RAM, international 4G LTE and even more.
The Galaxy S4 release date is rumored to be at CS 2013, in February. Hopefully Samsung decides to release it then, because we will have less time to wait.
The Samsung Galaxy S4 will probably come with a 4.9 or 5-inch display, though it's quite harder to use a bigger display, while keeping the device's size. And they won't increase the size anymore most likely, because it would compete directly with the Galaxy Note 2.
We will probably find out further info about the of Galaxy Note 2 specs after the launch of Samsung's Galaxy S3. At this point, the manufacturer is trying to create some buzz around their most sold series so the new version will enjoy some popularity at the time it will come out.