We knew something was probably up when MG Siegler arrived in Seattle last night, and here it is: The TechCrunch writer reports this afternoon that he has confirmed the existence of Amazon.com’s Android tablet. In fact, he says, he has seen and used it.

And he thinks it’s going to be big.

Whether this information comes from an official visit to Amazon HQ in South Lake Union isn’t clear, but the report looks reliable, and it’s consistent with other information that has leaked out about the device, which Siegler says Amazon is simply calling Amazon Kindle.

According to his post, Amazon is starting with a 7-inch tablet — selling for $250 — with a backlit touch screen (not E-ink). The device, with a specialized, carousel-style on-screen interface, comes with an Amazon Kindle app and offers Amazon’s music and video services, plus access to apps from Amazon’s Android Appstore.

The 7-inch version will be released around the end of November, he reports. If it’s a success, the company will then follow up with a 10-inch version next year. See the TechCrunch report for more details, and Gizmodo has a great mockup based on Siegler’s description.

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