Sometimes they send out a two disc edition automatically but it's rare, most I get through on dvd have just a trailer and a behind the scenes usually, but when I rent blu ray, they seem to have extras on.
I've got discs with lots of extras, and discs with no extras. DepenRAB on the film.
I'm with Blockbusters now, but was the same with Lovefilm(for dvRAB, didn't use blu ray on here).