The AdWords interface has always been difficult to navigate. Negative keywords and search term reports were two areas in particular that were not placed intuitively. Negative keywords were accessible only by clicking a “+” sign below all your regular keywords (usually far below the fold after much scrolling). Search term reports were only available after clicking the “Details” drop down on the Keyword tab. Neither was easy to find, but AdWords just made it easier.
Here is a screenshot of what you should see now (bear in mind that the rollout might not be system-wide yet):
As you can see, the Keywords tab now has 3 sub-tabs (buttons?) underneath for Keywords, Negative Keywords, and Search Terms. After clicking on each button the interface will look just like it did before, but organized in a more intuitive way.