dudmont :
Did intel take a major performance leap when skylake came out vs Haswell(skipping Broadwell, it's just not relevant)?
Yes and no. While the CPU side did not get much significant improvement, Intel did throw the bulk of their spare transistor budget at the IGP and Skylake's IGP is substantially faster than Haswell's. If Intel had wanted to, they could have blown that transistor budget at extra CPU cores but most mainstream software hardly ever makes use of more than two threads.
GPUs on the other hand are all about massive parallelism. Going from 28nm to 14-16nm allows AMD/Nvidia to put 3-4X more compute power in the same die space. You can bet your shorts that they will both launch GPUs with 75-100% more processing power crammed in half the die space as soon as their confidence in the manufacturing process will allow them to.