Today i haven't see the classic "ads by goooooogle" or "ads by google" on top of the ad. 100% of the times i saw an ad today, it was with the new design on the bottom of the ad, have noticed it too?
But i believe that ctr will go down, now it's more "visible" that those are ads i believe. We will see
I think the new look is better than the old. To be honest, I have found that as long as the ads displayed on your site are properly targeted, they interest your visitors enough for them to click them.
Google just done the 50:50 thing in this "Ads by Google" new logo, before we can see this link above the ad units and now they makes it down to the ad units, I think thats a cool one, but the new logo seems pretty much big comparing to the exist one, thats not cool anymore..
The new look looks nic but will it be better for CTR? I don't know. I think the "ads by goofle" is a bit too large though.