Google moved a number of reports from AdWords Report Center directly into Campaigns tab. Google says that "over the coming weeks, we plan to gradually move existing reports from Report Center into Campaigns tab, then retire Report Center entirely."
"Now you can use AdWords to see search terms and automatic placements where your ads appeared, segment your data by things like keyword match type and day of week, and email and schedule downloads of data you want to share. You can do it all on same pages where you manage your campaigns, making finding key performance drivers (and acting on your discoveries) faster and easier," explains Google.
So, how should you prepare?
- As a starting point, you can take tour of reporting tools in Campaigns tab in AdWords Online Classroom
- If you're an expert Report Center user with questions about how a specific area of reporting will change, you can download PDF guide to the transition
- Finally, you can check in on transition in AdWords Help Center