A listing for Sonic Boom: Fire & Ice over at Play-Asia has revealed some new details about the game both in terms of plot and gameplay. First, the game will have only 4 bosses, there are also six exploration-based levels and bonus stages similar to those found in Sonic 2.
The super villain, Dr. Eggman, discovers a powerful Ragnium element in Ragna Rock island which can fuel his robots and make them faster than Sonic. He then commands his mining robots to search the mythical island. D-Fekt, as one of them malfunctions and is now able to magnetize everything except Ragnium. With this capability, D-Fekt gains more power and messes up the environment of other islands creating fire and ice! Dr. Eggman makes him one of Island Defenders and now ready to face Team Sonic!
Other details appear to indicate that stages take place on different islands which have been captured, the player must beat each island in order to free it.