The Rockies’ rise into a playoff chase this season, they hope, will propel the club into contention for several years. On Wednesday, they announced the construction of a new Coors Field scoreboard to match. The video board hanging on a steel lattice frame in left field will be replaced by a high-definition video component during the winter after an agreement between the Rockies and the Metropolitan Baseball Stadium District, the state division that owns Coors Field. The Rockies will also install a new speaker sound system for their home ballpark. “A new scoreboard I’m hoping will last 15 years.