Apple's refreshed MacBook Pros were introduced to somewhat mixed reviews reactions last year, due to their specifications. Instead of using the latest Kaby Lake chips, Apple opted for previous generation Skylake chips.
This is what changed in WWDC 2017, as Apple updated all MacBook and MacBook Pro devices with Kaby Lake chips adding some other improvements.
Adding the new chips isn't going to dramatically improve the devices performance and there's no reason to upgrade if you bought one computer of the company last year. But there are some subtle advantages that should be mentioned.
You can read the list of specifications if you want from here and here, you just have to know that the Kaby Lake chip will not offer enormous difference from Skylake. It's somewhere around 10 percent faster, depending on what kind of work you're doing, though Kaby Lake will likely offer the biggest improvement over the Y-series chips in the 12-inch MacBook. It will also offer better integrated graphics and larger duration battery life, although Apple does not officially mention any improvement in the latter feature.
A big advantage of Kaby Lake that has little difference from Skylake in the processing power results is a DRM-protected 4K video decoder.
Most 4K shows and movies have additional encryption to prevent piracy and require special hardware for decoding. That's why there are a few computers that can play Netflix on 4K. Apple with upgraded computers supports the feature though it should turn on before you can play the 4K DRM-protected video.
I imagine it's only a matter of time, and although the MacBook Retina is not 4K, the extra feature will be highly appreciated.
Another subtle improvement is that Apple has boosted SSDs that will be "up to 50 percent" faster. That's 3,2 GBps read and 2,2 GBps speeds enrollments (tested on 512 GB drives). If you do a lot of photo or video editing, you'll welcome these speeds which are probably more noticeable than the processor improvement.
Meanwhile, the MacBook Pro 15 inch now comes with AMD Radeon Pro 555 in the lower configuration.
Pricing remained largely the same, except for the MacBook Pro without the Touch Bar starting with $ 1.299 thanks to a new storage format of 128 GB.
