Sandy Bridge E: 32nm, LGA 2011 socket, X79 Chipset, releases Q3 2011. Not sure on performance increase over Sandy Bridge, enthusiast level CPUs (and prices), replacing LGA1366 socket/X58 chipset.
Ivy Bridge: 22nm, LGA 1155 socket (backward compatible, maybe a new socket as well), H67/P67/Z68 chipset, releases Q4 2011, most likely Q1 2012. 20% increase on Sandy Bridge performance, mainstream CPUs
Both are separate.