Aquafornia has a great compilation of reporting on the question of a climate change link with respect to the California fires. The bottom line? Yes! No! Maybe!
The most compelling research to me on this question is Westerling et al. in Science last year. Aquafornia quotes an LA Times piece with a nice summary of the result:
The study, however, found Southern California was different from the rest of the West, with no increase in the frequency of fire as temperatures rose. “In Southern California, it’s hot and dry much of the year,” said Anthony Westerling, a climate scientist at UC Merced and the study’s lead author. In other words, Southern California was already perfect for fire.