Matthew Panzarino, writing for TechCrunch:
The technical nuts of it are that the MacBook can now be ordered with dual-core Intel M processors at up to 1.3GHz with 1866 MHz memory, Intel HD Graphics 515 with a claimed 25% faster graphics performance and faster internal storage. The new guts are getting you better performance but also better battery life with what Apple says is 10 hours of web browsing or 11 hours of iTunes movie playback.
These are solid updates to an already great machine. If I was in the market for a portable Mac, I’d seriously consider buying one.