Here's the official extended description for next Sunday's Route of all evil episode:
Disregard the "son of the Professor" part as it's wrong.
Cubert and Dwight, sons of the Professor and Hermes, are suspended from school for illegal use of the AV equipment. Upon their return to the Planet Express, they form a business -- a competing delivery company that threatens the existence of Planet Express. Meanwhile, Leela, Fry and Bender brew up a batch of homemade beer.
Also: Bumper Robinson is now confirmed as the voice of Dwight and Tress MacNeille will voice a character called "Brett Blob".
Update: And the week after ... a rerun of "Leela's Homeworld" most likely.