Socket 1155 is already "dead" there is nothing to upgrade to beyond the i5-3570k or i7-3770k.
Socket 1150 will get a Haswell refresh known as Broadwell in late 2014. However, Broadwell is not expected to be a significant upgrade over Haswell in terms of CPU performance. The main goal of Broadwell is a die shrink to 14nm from 22nm. The main goal is to reduce power consumption. There will likely be an increase in CPU performance, but it will probably be another 6% or so. Intel will improve the integrated GPU though. Early speculations is about 30% - 40% over Haswell generation graphics core. The main goal is to stay competitive with AMD's APU for laptops. It also puts pressure on nVidia as well in their low end graphics chips.
Intel never may any bold claims about CPU performance increase for Ivy Bridge and Haswell. Both averaged about a 6% increase in performance from the previous generation. That is why Broadwell may just be another 6% average increase.
The general hope is that Skylake in 2015 will provide a good performance increase like the 12% performance improvement Sandy Bridge provided. However, that somewhat depends on what AMD plans on doing. If AMD does not offer a successor to the Piledriver generation FX CPU in 2015 a good performance increase, then Intel may not feel compelled to increase CPU (a.k.a. IPC) performance with Skylake. So far AMD has not announced any such plans. They plan on continuing to produce the Piledriver FX CPU to the end of 2014.
Skylake will introduce an new socket that it and Skymont (2016) will use. In 2017 when Intel plans on releasing the successor to Skymont, they will introduce yet another new socket if they follow their recent track history.
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