Vorash

Unidentified Life Form 28 is a new, presumably boss creature featured in Metroid: Other M. It is a large, fish-like creature that rises out of the lava and attacks Samus Aran. It bears a resemblence to Magmoors in Metroid Prime, Crocomire from Super Metroid, Squeepts in Metroid, Metroid: Zero Mission and Super Metroid, and the Scarp in Metroid Prime 3: Corruption. It seems that Samus must somehow fight (or dodge) this creature by using the Grapple Beam to escape its attacks. Before Samus faces this creature, the ULF 28 would occasionally jump up from the lava in the background as Samus runs through the tunnel of Sector 2 / Pyrosphere. 

One trailer shows this creature with a Grapple Point inside its mouth, which shines on Samus as she grapples away. Another screenshot (pictured below) shows Samus tugging on the point in the creature's mouth.