The update is the EI22 build we have seen previously and will fix plenty of bugs and provide many additional features. It will begin for a small portion of users tomorrow and reach all within eight days, if things go according to plan.
Samsung EPIC 4G Overview
The Samsung EPIC 4G is Sprint's specially branded version of the Samsung Galaxy S. Samsung announced all their Galaxy S devices simultaneously, and the EPIC 4G has several unique features and capabilities that help it stand out from its brethren.
Unlike the other Galaxy S versions, the EPIC 4G takes advantage of Sprint's ever-growing 4G WiMAX network, which is why it's got that "4G" tacked onto the end of its name. Other differences include a 5-row QWERTY hardware slide-out keyboard and an LED flash to go with its 5MP camera. Unfortunately the EPIC 4G only has 1GB of internal memory as opposed to the 16GB included in the T-Mobile and AT&T variants.