From the link
Went and checked my guide. It's called Total Riff Off and the 3 one hour episodes have no info, but they do have titles."While there's no word specifically on what the crew will watch in the reboot, they're reportedly "expected to riff on some form of television programming." What that means in terms of National Geographic we'll find out on April Fool's Day."
"Killer Shrimp N' Friends"
"Guy and a Goose"
Guessing they'll just be riffing on some old weird animal documentaries.