I don’t notice much difference on the width, but now that you mention it… it does seem to have a little more room. Here is a screen shot of what I see. Both width and length are cropped a bit, but you get the idea…
SO the banners still show up, but interestingly by default the banners that I use are blocked. They are served up with the WordPress Ad plugin WP-Ads.
So If you post Ads as regular graphics or regular text, they ten to show up unless the URL is a coming from a known advertising site or subsection of a site. For example. CNN and Foxnews serve ads from both services like double click and from a specific ad folder on their sites. Both are blocked.