We were already pretty sure that Amazon's September 6th event would bring the unveiling of a new Kindle Fire, and now Amazon has made that even more likely with the announcement that the Kindle Fire is now sold out. This comes after several weeks of diminishing Kindle stock on Amazon's site, with the Kindle Touch completely unavailable as of a few days ago.

Unsurprisingly, Amazon took this moment to tout the Kindle Fire's success — while the company still hasn't officially given any sales figures, Amazon claims the Kindle Fire has taken 22 percent of the US tablet market. That's impressive, but it's worth nothing that the Fire has basically no global presence. It has certainly been a successful product, but there's still a long way for it to go before it can challenge the likes of the iPad. According to IDC, Amazon had about a five percent share of the worldwide tablet market in Q2 2012, compared to 68 percent for Apple.

Amazon also noted that, as with almost every flagship Kindle release, the Fire has been the best-selling product across all of Amazon.com. The company also said that ten of the top ten best-selling products on Amazon since the Kindle Fire's launch have been Kindle products or Kindle-compatible content. We're looking forward to seeing how the next year goes — with the dual threat of the Nexus 7 and the long-rumored iPad mini, the next Kindle Fire might face some tough competition in the 7-inch tablet space.