"A new generation of Power Rangers must master the mystical and ancient Samurai Symbols of Power which give them control over the elements of Fire, Water, Sky, Forest, and Earth. Under the guidance of their all-knowing mentor and the aid of their devoted animal Zords, they battle the dark forces of the Netherworld and a mysterious Warrior bent on destruction."
The Rangers of this season are as follows:
RED - Jayden, the leader. His element is fire and he pilots a lion Zord.
BLUE - Kevin, who lives in the Code of the Samurai. His element is water and pilots a dragon Zord.
YELLOW - Emily, is innocent, sweet and youngest of the Rangers. Her element is Earth and pilots an ape Zord.
GREEN - Mike, is creative, loves video games and a bit of a rebel. His element is the forest (For Shinkenger loyalist, Wood) and pilots a bear Zord.
PINK - Mia, is the big sister of the Rangers. Her element is the sky (For Shinkenger loyalist, Wind/Air) and pilots a turtle Zord.
Unlike the other seasons after MMPR, this season will last for two years, according to the article found at Variety, according to Elie Dekel, Saban's prexy, they will introduce new elements in the show along with the occasional additional Ranger.
This new season will air in Nicklelodeon in the US next year.
Source: Plot & Character Descriptions - Power Rangers Official Website