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I just tried to upload an animated GIF to my AdWords account, and was told
'Animated Ads Not Supported'
Yes, I'd expect to see that message still, as the test has not yet started. Here is a bit of info from an AdSense page linked to farther below:
Google will soon be expanding its image ad program to include a wider variety of creative formats. We'll be accepting animated GIFs from a small test group of advertisers, and you'll be able to display these ads on your pages! The new ads will still adhere to the 50KB size limit, and will be reviewed according to our editorial guidelines for image ads. You can opt in to image ads from within your publisher account – for full instructions, please refer to the AdSense FAQ.
Quoted from this AdSense page: