Originally Posted by
ltron
I think that it's unlikely that they'll skip Broadwell-E, whether Broadwell-E is worth it as an upgrade is debatable considering the 5% performance difference between Haswell and Broadwell at the same clock speed. The only way Broadwell-E would be worthwhile is if the £500 part, the 6930k, is an 8 core instead of a 6 core.
If you overclock, I think you may be underestimating the benefit of the 2 extra cores in rendering and encoding workloads, especially since there is only around a 10% performance increase going from Haswell to skylake, if that. However, skylake is still a capable performer.