I'm really excited about Kaby Lake. Most see it as just an incremental improvement, but here's why I think it's really nice:
1. Optane (crosspoint) memory - crazy fast SSD's that run at 6-7x current SSD speeds. System responsiveness will be amazing.
2. On-cpu HEVC decoding. Super low cpu utilization for new 4k content playback (and even 1080p/720p stuff encoded with the new more efficient codec). In 5 years when you retire the macbook, it will make a great HTPC.
GPU doesn't matter that much to me right now. I'd build a desktop if I want to game, though I'm sure there are some improvements.
More than anything I wish residential broadband would improve. Let's assume a fairly common 50Mbps home internet connection:
Internet - 50Mbps
PCI SSD write speed - around 500MBps = 80x faster
PCI SSD NVME write speed - around 900MBps = 144x faster
New Optane write speed - around 2GBps = 320x faster
That's right - our internet can only download at 0.3% the speed of new SSD's.
If you're lucky enough to have Google Fiber at 1Gbps, you're at 6%.
SSD's are damn fast, and we need better internet! I suppose you could argue that since these are laptops the next generation with a die shrink would be even better because of improved battery life, but it's a pretty nice update. (I'm on a 5 year old machine right now).
I'm on 1Mbps... (rural France)
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Intel has not given any reason why they cannot deliver Iris Pro 580 based chips. There was a press release in May, that now they're coming... but no. Still, you cannot buy any Intel processors with Iris Pro 580... and that is an essential part of Skylake family. And the missing part of rMBP 15" and iMac 21.5".
My reaction was not just for you, but all you who are saying, that Apple is not updating their computers and who read Wikipedia like Bible. It states Q1/2016 because Intel has not given any official explanation or new dates. For me, it seems, they will jump silent directly to Kaby Lake. My only evidence is, that you cannot buy the mobile chip from any dealer as of now.
Please, Google Iris Pro P580 and look all the information and reviews available. Only Intel press release based vaporware.
What about the Skull Canyon NUC, the one with Iris Pro 580:
https://www.amazon.com/Intel-NUC-NUC6i7KYK-Mini-BOXNUC6I7KYK1/dp/B01DJ9XS52