While we have delivered tons of Intel Haswell coverage on Phoronix -- more than 100 stories on the latest-generation Intel processors and graphics written by your's truly -- one of the areas not yet covered have been the high-end Iris Pro Graphics with integrated eDRAM. We haven't been able to run any Linux benchmarks of the Iris Pro due to lack of hardware, but System76 is said to be soon sending over a review sample of their Galago UltraPro with Iris Pro Graphics 5200. In the meantime, however, a Phoronix reader has graciously lent us remote access to his Iris Pro system for Ubuntu Linux graphics testing.
It looks like one of the fastest Linux CPUs with open drivers. Will see if the "R" desktop CPUs are ever available somewhere, but no rush though, it still apparently needs 3+ months to be reasonably optimized.