Intel is working on another high-end desktop (HEDT) chip codenamed Ivy Bridge-E. In many ways it is similar to Sandy Bridge-E in that they are increasing the core, cache, and memory channel count to produce the chip. According to a leaked Intel roadmap, this chip is sent to be released Q3 2013, sometime after Haswell makes its debut.
The roadmap above is the latest leaked version and I have some suspicions that it could be a fake. Look at the word Haswell. Do you see what I see? I find it highly unlikely that an Intel roadmap would have red, squiggly incorrect spelling marking underneath an actual roadmap. This makes me lean towards a fake.
That said, Ivy Bridge-E is said to run on existing X79 chipset motherboards and the LGA2011 socket. It is possible that Intel will produce a new chipset to go with Ivy Bridge-E, but they previously kept the X58 chipset over two generations of HEDT chips (45 nm Core i7 "Bloomfield" and 32 nm Core i7 "Westmere").