Hey! I just noticed something which i think you would be interested in. In the video the magic of Halo 4 you will see a script with the lines of Dr. Halsey. If you have read the Halo Book Ghosts of Omyx Dr. Halsey including several Spartans II & III were trapped on a forerunner world (Actually more in the place between Slipspace and Normal space). Does this mean that they were freed? This would not only mean that Spartan 117 would not be the last Spartan II left but could these characters play influence to the story line? Could this forerunner world the UNSC were stranded at be where Dr. Halsey and the Spartans were?
Just thought id point it out