sofia vergara idris elba james darcy Sofia Vergara's 'Modern Family' mom cast; 'Luther' Season 3 starts shootingBite-sized news from the world of TV, including a co-star for Chloe Sevigny in her A&E pilot, a “DreamWorks Dragons” holiday special and TLC’s renewal of “Long Island Medium.”

– Get ready to meet more of Gloria’s family on “Modern Family”: Elizabeth Pena has booked a guest starring role as the mother of Sofia Vergara’s currently very pregnant character. And Stephanie Beatriz will play Gloria’s sister, Sofia. [TVLine]

– BBC One had previously announced plans for Season 3 of the addictive Emmy-nominated Idris Elba detective series “Luther,” and now the U.K. network has released a video teaser confirming the start of shooting on “four perfectly dark, chillingly-formed episodes.” [BBC]

James D’Arcy (currently in theaters as multiple characters in “Cloud Atlas”) has landed the male lead as a forensic profiler in A&E’s pilot “Those Who Kill.” He joins Chloe Sevigny, who stars as a detective tracking serial killers. [Deadline]

– TLC has ordered a 30 episode fourth season of reality hit “Long Island Medium” starring psychic and mother Theresa Caputo. The new episodes are expected to launch in March 2013. [THR]

– FOX and DreamWorks are teaming up for the holiday special “DreamWorks Dragons: Gift of the Night Fury,” based on the hit animated film “How to Train Your Dragon.” The half-hour special will premiere Dec. 17 and feature the voices of Jay Baruchel, America Ferrera and Gerard Butler. [FOX]

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