Google has been improving the way that its Googlebot searches dynamic web pages for some time - but it seems to be causing some added interest just at the moment.
How Google scans sites for information to index isn't ever made clear to anyone for fear that the knowledge would be useful in black SEO. However, there are many who think that white SEO is not only a valid process but one that puts good content where it should be. Think of it as leveling the search bot playing field.
Other people have reported strange things happening to shopping carts. One rumor is that large orders are being placed consisting of one of each item on sale, only to be aborted at the last minute.