If you go to Park Kalkriese in Germany, you can buy an Arminius beer, but as far as I know, this is the first time a US brewer has decided to make one. The August Schell Brewing company in New Ulm, home to the other Hermannsdenkmal, is about to bring one to market:
A radical departure from Schell’s signature lagers, Arminius is distinctly hoppy with a fruity, floral aroma. The beer does not, however, depart from Schell’s rare ability to marry tradition and innovation. Combining the hop profile of west-coast American IPA’s with traditional German brewing techniques, Arminius will be double dry hopped and brewed with over 2.5 pounds of hops per barrel.
Full release here.