https://www.youtube.com/watch?v=0cyLCyI8ptk
Halo 4 Explained :: Halo 4 NEW Below (READ)
Everything that happens::
You Reach SR:50 and once you choose a specialization you are automatically put to SR:51
The credits are re-set so you can rank up quicker.
-Get to choose a specialization.
-New armor
-New emblems
-New DMR Skin