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Even at a lower price, the Nexus tablets haven't been as popular as the iPad. Pichai said the Nexus products account for about 10 percent, or 7 million, of the roughly 70 million tablets now running Android software.
In the first half of this year alone, Apple sold 34 million iPads, including full-size models.
Amazon.com doesn't disclose its sales of Kindle Fires, which run on a modified version of Android. The research firm IDC estimates about 1.8 million Kindle Fires were sold during the first three months of this year.
The Nexus 7 will be the first device to get the 4.3 version of its Android software. It's a relatively minor upgrade from the "Jelly Bean" flavor of Android. Google still hasn't said when it will release a more comprehensive Android overhaul, currently known as "Key Lime Pie."
As with the original line of Nexus 7s, the new devices are being made by AsusTek Computer Inc., working from Google's design.
Google is still tinkering with a new line of Nexus tablets with 10-inch display screens. The Mountain View, Calif., company also hasn't updated its Nexus 4 phones, though it worked with phone makers to release variants of Samsung's Galaxy S4 and HTC's One this summer. The variants run a pure version of Android, without the customizations added by the phone makers.