It seems like they will post a tool that selects a random theme from the show right before the jam starts.
The podcast is from the people behind things like Car Boys and My Brother, My Brother, and Me and is about creating strange games based off of bad suggestions. Here are some links to familiarize yourself with the show:
Yeah, we will be posting a tool that randomly selects from the themes. So you or your team will be given one.
We have a list that we are filling out using the wikia/listening to the podcast. We're vetting some of them (only if they're really specific/really difficult), and for others, we are giving short explanations if they are obscure. Right now there's around 150 different themes on the list.