I was looking through the game's sound files when I found some...interesting things.
The first file's called "joust_get_ready", which is a weird echo-y voice saying "Get ready to joust!"
Then there's four different sound files named "joust_power_up_#", the numbers being 1-4. These are weird...pinging sounds, not sure how to describe it.
Unless Telltale's planning a reboot of a certain ostrich-riding arcade game, I can't imagine what these are for.