Here is an overview of the game, via Nintendo.com:
Join Intergalactic Bounty Hunter Samus Aran in Her First New 2D Metroid Story in 19 Years
Samus’ story continues after the events of the Metroid™ Fusion game when she descends upon planet ZDR to investigate a mysterious transmission sent to the Galactic Federation. The remote planet has become overrun by vicious alien lifeforms and chilling mechanical menaces. Samus is more agile and capable than ever, but can she overcome the inhuman threat stalking the depths of ZDR?
Face Off Against Unrelenting E.M.M.I. Robots
Once DNA-extracting research machines, the imposing E.M.M.I. are now hunting Samus down. Tensions are high as you evade these E.M.M.I. to avoid a cruel death while finding a way to take them down. Find out what turned these robotic wonders into the scourge of ZDR and escape with your life.
Feel Samus’ Power Grow as You Gain Maneuvers and Abilities
Acquire new and familiar abilities as you traverse the many environments of this dangerous world. Parkour over obstacles, slide through tight spaces, counter enemies, and battle your way through the planet. Return to areas and use your new abilities to find upgrades, alternate paths, and a way forward. Explore the sprawling map, evade and destroy E.M.M.I. robots, and overcome the dread plaguing ZDR.
Watch the announcement trailer, first gameplay, and a development history video below. View the first screenshots at the gallery.