With the iPhone 5 not even reaching customers' hands yet, the latest rumor floating about that the South Korean company is set to unveil the Galaxy S4 at Mobile World Congress (MWC) 2013.
Korea Times is reporting that Samsung are preparing for an announcement of the S4 at MWC 2013, before reaching retail in March. An unnamed Samsung official has said that it will come with a similar design to the immensely popular S3, keeping its "rounded rectangular shape with rounded corners", but would look to increase its screen size to 5 inches.
It would still be powered by the quad-core Exynos chip, Android (most likely Jelly Bean), and it would support 4G LTE networks across the world. Other reports are suggesting that Samsung could use their flexible screen technology for the S4, but no final decisions have been made yet.
I don't think we'll see a 5-inch version, as it might be a little too big for the mainstream, but given the success of the already-large 4.8-inch S3, this could actually happen. It's not too much bigger than the S3, whilst being a little smaller than the Note at 5.3 inches, and the Note II at 5.5 inches.