I noticed it added some annoying news thingy akin to Opera Discover. It had better only update that on Wifi...
Google Maps managed to sneak in a whopping 0.92MB last month, combined with Google Services resulting in an unexpected €1.50 bill.*
You can disable applications from using background data completely from the data usage settings. It's a pity you can't just tell it to block everything from what I can tell (besides the autosync thing).
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