Resistance 2 questions!

ok so i just finished resistance 2, and im ****ing confused! was everyone confused at the end of this? cuz its been over a year and a half since i played all the way through resistance: fall of mans campaign and i dont know who the **** the guy is who turned into the giant angel that you killed in the last level, how was nathan hale related to him?! also what was with the force abilities after defeating him? did the developers just want you to think of emperor palpatine? or is there some purpose to this? also are the chimera actually aliens? and what was that big black slag pile behind hale and his squad member at the end? and does anyone know a date for resistance 3? and who the main charecter is going to be? i would love any opinions! thank you!