A young, fresh Helles, so while still a malty, fully-attenuated Pils malt showcase, the hop character (aroma, flavor and bitterness) is more pronounced, and the beer is cloudy, often with some level of diacetyl, and possibly has some green apple and/or other yeast-derived notes. As with the traditional Helles, the Keller version is still a beer intended to be drunk by the liter, so overall it should remain a light, refreshing, easy drinking golden lager.
Most Pale Kellerbiers are young, unfiltered, unpasteurized versions of Munich Helles beer, although Pils or a different, custom golden lager beer designed specifically for serving young could also be used. The best examples are served only on tap at many of the Munich area breweries. Bottled versions are not likely to have the freshness, hop character and young beer notes exhibited by the draft versions.
(local) Paulaner, Paulaner Brauhaus, Hofbrau, Tegernseer Tal. (bottled) Ayinger Kellerbier, Hacker-Pschorr Munchner Kellerbier Anno 1417, Hofbrau Munchner Sommer Naturtrub, Wolnzacher Hell Naturtrüb