Google Changes Its Display Format?

I did not see any announcement but you will notice some changes when you run a search on google. The logo is now smaller and in the upper left corner. There is a large space in some searches between the top of the page and the first results. There is also a little click area called "Show options" which can really refine your search results. I suspect that empty space will be filled in by some change in Google Adwords or other marketing things but to be honest, I can't find anything posted anywhere on this.