One of my sites indexed pages has triples and backlinks have doubled since lastnight. There's a russle in the leaves, a chill in the air.... you know whats coming fellas.
Surely lot more happening with G these days, and in my case im noticing sudden drop in indexed pages count. But then its usual for me, i know they'll be back in no time.
I have had experienced the same with most of my websites, but a 4-5 days ago anyway. I think the huge increase / decrease indexed pages is a sign of some evaluation process. I am saying this as my "own assumption" and no documents or facts backed it. If you have any object please do not hesitate to correct me.