I have already run Intel Ivy Bridge benchmarks on Linux 3.11 to find not much has changed with regard to the OpenGL performance when using Mesa 9.2-devel. However, with more of the Intel i965 DRM changes in Linux 3.11 dealing with Haswell, I also ran some comparative Linux kernel tests there too.
From an Intel Core i7 4770K "Haswell" system with HD Graphics 4600 I ran some benchmarks between the Linux 3.8 and Linux 3.11 Git kernels as of this week. Full system details and all of the results are within 1307182-SO-INTELHASW40.
While the Linux 3.10 kernel brought with it performance improvements for Intel's new Haswell hardware at the time, there's no further kernel-side changes on 3.11 that dramatically change the numbers.