AdWords Editor 5.0.1 has been released. From the release notes [google.com]:
Updated feature: The four tabs for ads (text, image, local business, and mobile) are now grouped under a single 'Ads' tab. This release addresses a space issue that only affected some users. If you aren't experiencing any difficulty, it isn't necessary to upgrade.
If you do upgrade, and you have comments on any of your campaigns, ad groups, keywords, ads, or anything, make sure you export them out first before you do your upgrade! I learned the hard way that upgrades wipe out comments.