Not yet. This was one of the problems that was causing delays for 6.0's release. If you were to pick 2 podcast categories for a podcast, then we would not know which subscribe links to provide, or have to provide both. This gets even more complicated for those podcasters who have 10+ category podcasts.
We're still working out a plan to prioritize the podcast categories, that way which ever has the highest priority would be the one used. We're still testing this idea out theoretically though. What are your thoughts on this problem?
Obviously if you only have one podcast category then you would not have to worry about this problem.