According to Entertainment Weekly, the films will take place during the time frames of the original three movies (which, if you remember, took place after the last three movies) which would meancharacters like Darth Vader and Jabba the Hutt could be included.
The movie has the sort of dry, bracingly unwholesome humor that relentless mayhem can produce if the characters are mean and abject enough and the storytelling is speedy and laconic.
It does not take much research to discover that BYD are the initials of the Chinese characters Bi Ya Di, which does not mean anything but sounds foreign or Western.
This axiomatic principle is easy to state but can be difficult to apply in the context of fictional characters because a properly copyrighted work does not mean every element of the work is protected.