I noticed the 6″ Amazon’s Kindle is out of stock on Amazon.com with no indication of when it might return. Put on your rosy-colored speculation glasses and you might expect to see a Kindle 3 refresh in the coming days. Rumors of an August announcement have been swirling around the net for a while now, suggesting a slimmer version with improved contrast and the color screen for instance – although I don’t expect the color thing just yet. Then again, it could simply be that they are selling Kindles faster than they can keep up with demand since they lowered the price to $189. Stay tuned.