So far, there have been a lot of speculations about Samsung Galaxy S4, and some of these rumors state that Samsung S4 might use 5-inch full HD display, an 8 core processor, a 13MP camera and 2GB RAM. Some speculations say that we might even get Eye tracking technology with the latest Galaxy smartphone, and according to the latest rumors, Samsung Galaxy S4 should use a 802.11ac WiFi technology, also known as 5G WiFi. Samsung Galaxy S4 might get a BCM4335 chip, which has 802.11ac WiFi, Bluetooth 4.0 and FM radio technology, all built-in a single chip.
As for the release date, rumor has it that Samsung Galaxy S4 might be introduced on March 15th, and available for sale in April. Bear in mind that these are just speculations, and there has been no official information from Samsung so far.