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As you have noticed, we are testing new text ad fonts for a limited number of publishers. If we roll out this feature to all publishers, we will be sure to let you know.
After all, all these years, we've had to deal with Adsense ONLY in one font while our site was in another. I think a good move although I gotta agree with stuartmcdonald that earnings have been really lousy since they started testing.
The comic sans usage is really, really silly. I understand that they need to test a wide range to get as much data as possible, but the type face is going to stand out and look silly on 95% of sites.