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I don't think that there will be a noticeable performance increase as kaby lake processors are not much more powerful than Skylake processors. Battery life could be slightly better though.
 
General performance is up ~5-10% from benchmarks ran on other computers.
Battery life stays the same.

It's a very minor boost there. The update to Kaby Lake would be almost pointless except, maybe, that it might provide a good boost to >4K content playback (which will help with Final Cut Pro as well) since Intel is upgrading the built-in video accelerator.

So if you are a heavy iMovie/FCP user, you may see some improvement.

Otherwise, finding a 2016 model at a discount would be better.
 
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General performance is up ~5-10% from benchmarks ran on other computers.
Battery life stays the same.

It's a very minor boost there. The update to Kaby Lake would be almost pointless except, maybe, that it might provide a good boost to >4K content playback (which will help with Final Cut Pro as well) since Intel is upgrading the built-in video accelerator.

So if you are a heavy iMovie/FCP user, you may see some improvement.

Otherwise, finding a 2016 model at a discount would be better.

You're probably right about that, but at this point with WWDC only a couple of weeks away it would be worth waiting in the off-chance that Apple has something up their sleeves..... Most likely not but you just never know.
 
General performance is up ~5-10% from benchmarks ran on other computers.
Battery life stays the same.

It's a very minor boost there. The update to Kaby Lake would be almost pointless except, maybe, that it might provide a good boost to >4K content playback (which will help with Final Cut Pro as well) since Intel is upgrading the built-in video accelerator.

So if you are a heavy iMovie/FCP user, you may see some improvement.

Otherwise, finding a 2016 model at a discount would be better.
That's true but it will also depend on what processors they go for. I have said since around August that I strongly think they will drop the m3 due to the (at the time, rumored) rebrand to Core-i chips, except the m3 and the close processor pricing. This means that we would see a greater improvement.
 
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