That version of Ridley was lame, for two reasons: one, it means that the real Ridley is dead (he was frozen, then smashed into little pieces, like that liquid metal Terminator), and that the last fight with him is this doofy-looking blue version with an ear-shredding scream. Now, assuming the next Metroid game isn't a prequel, spinoff or whatever (i.e., it isn't Metroid Prime Pinball 4), that means that the only way you'll get to fight Ridley is through some MGS-style plot twist revealing that he's a clone, or the one that was frozen was a fake Ridley, or that he's secretly Samus' mom (making him secretly a lady Ridley, which calls into question the existence of a male Ridley).