I listened to this fantastic podcast about 5th edition 40K last night. It was on The D6 Generation and featured the head of Dakka Dakka as a guest. It was an hour and a half going over all the changes in 5E, including play testing. Having not played previous editions, I was happy to hear how it added familiar concepts from Warhammer Fantasy. The podcast is highly recommended if you have an hour and a half to spare.
Bottom line: new players should find it more approachable, while grognards might not appreciate it. Many of the rules, taken invidividually, sound broken, but as a whole it works to create a more cinematic game. Listen to the podcast.