According to The Hollywood Reporter, the new Hawaii Five-O hails from CBS Studios, Star Trek writers Alex Kurtzman and Roberto Orci and CSI: NY executive producer Peter Lenkov, and centers on an elite branch of the Hawaii State Police headed by Steve McGarrett (Alex O'Loughlin).
Williams, who was played by James MacArthur on the original series, is a New Jersey cop who has recently undergone an acrimonious divorce and has transferred to Hawaii to be near his 7-year-old daughter. Forced to partner with McGarrett, Danno is initially leery of their association -- but as he grows more familiar with his maverick new boss, he begins to appreciate the opportunity to work with McGarrett.
The character's name was immortalized by McGarrett's catchphrase, "Book 'em, Danno!" which closed most episodes of the original series and is expected to live on on the new show.
He will then segue to Hawaii Five-O as a regular if the pilot is picked up to series.