I believe that the "Google Dance" is a relatively specific term that refers to the different datacenters holding different PR ratings or BL numbers for the same site. When you use a tool that allows you to check the different datacenters you will see the discrepency and then know a change is in the works. My impression has been that this will only give you a warning of a day or two tops because G isn't going to allow their different datacenters to hold different data (else their users will have a different experience depending on what datacenter they happen to hit).
So in short, I don't think the info you have presented suggests that we are entering a new dance.
Also, while lots of bot activity on your site is always exciting and important it doesn't mean that you have an update in store. G is just checking you out and updating it's cached view of your pages. That's all you can bet on.
Considering how overdue we are for a PR update I'm personally starting to wonder if they are in the works of changing the rules for how they handle PR...but that's just a hunch that I haven't run past anyone else yet.
All in all...you won't know that an update is in the works until you see the result. Unless you sit around watching the datacenters all day. But even if you do that, you'll only know a day or two in advance tops anyway.
Let us know if you see changes to your PR or BLs!

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