W2W2nite 3/10/21: Comedy Central

The citizens of South ParQ are clamoring for the COVID-19 vaccine. A hilarious new militant group tries to stop the boys from getting their teacher vaccinated.
The hour-long supersized episode titled South ParQ Vaccination Special premieres on Wednesday, March 10 at 8:00 p.m. ET/PT on Comedy Central with two encore airings at 9:00 p.m. ET/PT and 10:00 p.m. ET/PT. The premiere will simulcast on MTV2.
https://youtu.be/HreDhYZq9F0
"There are also other characters that come and go (also owned by the Warner Bros. Discovery conglomerate media company)."
Huh. Is that just referring to other characters from the show itself, or is this implying that the new season is going to have cameos from other WBD IPs