On the official Google analytics blog they have pre-warned us all that they are making some changes to the referring string from Google natural search. You are OK, if you use Google Analytics, you will just need to do a software update.
Other wise depending on your particular set up you may need to make some changes. You can see their article here.
This will gradually roll this out. And the main difference they explain is the change from the part that starts “/search?” to “/url?”.
What does this mean? Well if you use this ‘search’ to determine that the visit is from natural search you need to make a change. Otherwise you will get confused between your paid and natural search results.