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).