strange results in googlebot results

Not sure if the tracker for the sitemap was just missing some of the activity or what.

I normally will have no more than 1 googlebot showing up at my site at a time. For the last two days, Tuesday and Wednesday, I had no less than 6 on just the forums, and they were there constantly.

When checking my sitemap stats, however, it showed less indexing than normal for googlebot. Anybody else noticed this happen?

I also faced this strange thing. One day google crawls around 23k urls and the next day it is 15k
Also there is another strange thing i noticed for the last 3-4 days everytime i make a search site:domain.com i get incredibly different results. Hack even yesterday i got 727.000 results which is totally impossible
I believe google is getting ready for the update thats why all these things happen.