LOL @ "20%" improvement from Broadwell (Core M 5Y10/5Y70) to Skylake (Core M7/M5/M3)... what are you even talking about. The actual improvement from broadwell to skylake
at the same frequency is
2.4%!!!!
Source:
http://www.anandtech.com/show/9483/intel-skylake-review-6700k-6600k-ddr4-ddr3-ipc-6th-generation/9
"Sandy Bridge to Ivy Bridge: Average ~5.8% Up
Ivy Bridge to Haswell: Average ~11.2% Up
Haswell to Broadwell: Average ~3.3% Up
Broadwell to Skylake (DDR3): Average ~2.4% Up"
That's straight from Anandtech, the most reliable/respected source on the internet for this kind of information.
NOW REMEMBER THAT THE SKYLAKE VERSION OF CORE M OPERATES AT 100Mhz LESS THAN BROADWELL.... NOTE THE "1.4Ghz" CONFIGURABLE FREQUENCY ON BROADWELL
SOURCE:
http://ark.intel.com/products/84672/Intel-Core-M-5Y71-Processor-4M-Cache-up-to-2_90-GHz
http://ark.intel.com/products/88199/Intel-Core-m7-6Y75-Processor-4M-Cache-up-to-3_10-GHz
So you can totally forget about any CPU performance increase whatsoever, it will be EXACTLY the same performance CPU-wise. GPU you'll get maybe 10-20% real world improvement, 40% if you run only synthetic benchmarks like 3DMark or TRex offscreen. Intel is a complete joke in terms of GPU, so I guess that's impressive? IDK
The real improvements for the 2016 Macbook will be a better screen, more I/O, and possibly a faster SSD/more storage options. Otherwise you get the exact same system. Please stop falling for the intel hype, they are a joke CPU designer in mobile and consumer products in 2016. If you want quality intel products you have to buy Xeon, otherwise you're just buying cut-down crap they won't even try to sell to enterprise consumers.