The CW Friday sci-fi dramas Smallville and Supernatural won’t return from a winter hiatus tomorrow night as scheduled. In a last-minute move, the network is delaying the shows’ midseason premiere to next Friday to give tonight’s winter debuts of The Vampire Diaries and Nikita extra sampling with encores on Friday as they will face Fox’s American Idol for the first time. Additionally, there are CW preemptions in several markets tonight.