A couple of new musicals, Liberace bio-tuner “All That Glitters” and pirate tale “Treasure Island,” have each set the stage for the next step in development.“All That Glitters,” the musical about the life of flamboyant ivory-tickler Liberace, is skedded for an industry workshop May 8-11 in Gotham. Auteur of the production is Alexander DeJong, who directs and choreographs and also penned the music, lyrics and book (with James A. Walsh). Tom Nelson provides additional music. Costume designer Bob Mackie is onboard the project as part of a design team that includes John Arnone (sets) and Howell Binkley (lights). In the workshop Liberace will be played by a trio of actors: Richard Kline, Zachary S. Berger and Kevin Dolan, each portraying the central character at a different stage in his life. Those involved in the show aim to get it to Broadway in April 2013, according to a rep. “Treasure Island,” meanwhile, has set a world preem run at Arkansas Repertory Theater. The musical, with book by Brett Smock and Carla Vitale and songs by Corinne Aquilina, was seen in Gotham in an industry showcase in October 2010. Helmed by choreographed by Smock, the show reps the latest attempt at a stage version of “Treasure Island,” including the play incarnation that bowed in Brooklyn last year and a 2007 version by Ken Ludwig. Arkansas stint for “Treasure Island” run March 8-31, 2013.