I've seen several postings about this now in the last few days, although this is my first actual experience of it.
I'm being hit very hard by google's freshbot at the moment, and going deep too. At first glance at what is currently going on with the little guys, I had to check and double check that the IP's were 64.... (they are).
It's behaviour, in terms of hard hitting and depth of crawl (it's going through the entire site) is more like the character of the old deepbot.
In fact, it's identical behaviour to deepbot the last time it crawled this site back in April.
I'm interested in hearing from others who are seeing the same.