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.
Taken together, all of the new changes make for a more solid game (as solid as you can get with random number generating cubes).
It was strange to read so much complaining on different forums when players didnt even have the full picture.
The system feels like the best of 3rd and 4th edition, minus a lot of cheese