I've seen this layout before but in different colors, lets hope google doesn't make us use random colors that switch all of the time..
I think they will let you customize it as much as possible... but they are trying to get rid of "to much" blending for sure.
I noticed that one on my site today. My border and background blend in with my site's background, so you couldn't even see the curve, just the different writing.
I think it's quite nice. I don't like current ones adsense signatures. But how it affects clicking... Need time to test it.
Yes, first I've seen with the logo in the upper left. Just read your post though and it appears I was only a week or so late
i am seriously looking after other alternatives. but will the name Google invoke people's curiosity ?