Ages ago, John Rhys-Davies spent a few days visiting the Hobbit set while he was in New Zealand. Unlike Elijah Wood or Orlando Bloom, for well-known reasons there was no announcement that he would reprise his role as Gimli son of Gloin.
However, at a recent convention, a Reddit reader asked him point-blank about a possible cameo in the Hobbit.
At first [Rhys-Davies] denied it, but after a little pressing he smiled really big, laughed, winked, and said that maybe it was possible. His smile… his laugh… I’m taking this as a pretty big indicator that he will be involved in some small way.
Considering that in Lord of the Rings, Rhys-Davies also provided the voice of Treebeard, could it be possible that for The Hobbit he might cameo something like the voice of one of the trolls? (Highlight the sentence to see our hidden, possibly spoilerish speculation!)