It seems Google is rolling out a new kind of advertising (behaviorally targeted). Adsense publishers have been sent a mail describing the new advertising model. Here is an excerpt of the mail:
Hi,
We’re writing to let you know about the upcoming launch of interest-based advertising, which will require you to review and make any necessary [...]

Till today, the Adsense login page looked like

The new layout looks like this:

An AdSenseAdvisor has posted on webmasterworld that you have a chance of expediting Adsense+Analytics Integration process
Want to integrate your AdSense account with Google Analytics? Improved reporting was on publisher wish lists this year, so we’re spreading the reporting cheer this holiday season. Fill out our interest form, and we may be able to enable the [...]

We’ve already heard about the cost cutting methods deployed by Google, like curbs on the otherwise lavish holiday parties and efforts to boost revenue by an increase in the number of ads shown on the search results page.
Now it seem Google is cutting out on gifts to it’s top performing AdSense publishers this Christmas.
“..we feel [...]

This is the first time I have seen an Interactive JS ad. (not flash) on the Google Adsense Network. The IFRAME source was ads.gmodules.com instead of the normal pagead2.googlesyndication.com.  An animated demo of the interactive ad had been shown below.

Although I’m not sure if you’ll be shown the same ad, have a look here.

In the past, Google would send out your PIN (Personal Identification Number) when your earnings reached $50. However, it has recently been changed to $10.

Official Blog