I think they are behind in updating the webpage for the 3.0.2 preview. They've been pushing it out OTA for a while (that's how I was updated).
There were people who had issues with slow page turns when the Kindle was out in the heat (me) and other's who had spontaneous restarts. The new firmware seems to have fixed those problems. Amazon was most likely looking for feedback to make sure those with problems had the problems fixed (mine was).