Short answers, pulled from the story.
The trilogy covers all three films of the Star Wars original trilogy: Star Wars (1977), The Empire Strikes Back (1980), and Return of the Jedi (1983). Each film is retold as a separate Family Guy episode, with the final collection released on Blu-ray and DVD in the United States on the 21st of December 2010.
The title comes from a phrase Han Solo says to Chewbacca in The Empire Strikes Back, delivered as Chewbacca was laughing at Han Solo.
Yes. Lucasfilm officially endorsed "Blue Harvest", and George Lucas personally told Seth MacFarlane that he had TiVoed every episode of Family Guy. Lucas said it was one of only two shows he watched, the other being Jackass.
Series regular Kirker Butler wrote "Something, Something, Something, Dark Side" before the 2007-2008 Writers Guild of America strike. He completed the first draft in four weeks under Seth MacFarlane's guidance, and the episode was directed by Dominic Polcino.
The episode had two working titles before settling on "It's a Trap!". The first was "Episode VI: The Great Muppet Caper" and the second was "We Have a Bad Feeling About This", a reference to the recurring Star Wars catchphrase.
Writer Alec Sulkin said further Star Wars parodies were unlikely, citing the difficulty of spoofing The Empire Strikes Back and the 2012 Disney acquisition of Lucasfilm making the relationship more rigid. Seth MacFarlane also stated on Twitter that Disney keeps a tighter hold on the franchise, making additional parodies unlikely.