The big change is that Google's Knowledge Graph is now available worldwide for all English language versions of Google. So now if you are in the UK, you will and should get the knowledge graph results.
The second big change is that Google added a carousel to the knowledge graph results. The carousel expands up at the top of the page, and then flips through various results. Here is a picture:
In addition, the knowledge graph results show up in the search box as you type now:
Here is a video showing these features off:
I personally do not see these results yet, so I haven't personally played with it.