Unfortunately Ron Perlman has confirmed that he will not be showing up in Peter Jackson's two-part adaptation of The Hobbit. Perlman simply said, "I'm not doing [it]."
It's been rumored for years that Perlman was attached to the project when Guillermo del Toro was directing the film. We all just assumed he stayed on the project after Del Toro left, but apparently Perlman went ahead and made other plans as well while the production was going through hell.
That's really too bad, I'm a big fan of Perlman and his work, and I would have loved to see him in these Hobbit films.
Perlman will next be seen co-starring with Nicolas Cage in Season of the Witch and will once again work with del Toro in the H.P. Lovecraft adaptation At the Mountains of Madness in addition to a number of other film and television projects.