This piece isn't finished as I'll be adding armor on the only visible arm and also a helmet.
This is what I believe the Sangheili(elites) who are aligned with Thel Vadam (arbiter) would look like in Halo 4 and not the elites who follow Jul' Mdama.
A side note, I really really hope the armor that the sangheili in Mdama's faction isn't the "retconned" elite armor for the new trilogy. I really hope if we do see Vadam's forces that they look more like the elites we see in either Halo 3 or Reach armor wise.
When it comes to Halo 4 designs for the elites I give an A++ out of 10 for the actual sangheili physiology and reverting back to the Halo 3 form of the elites. But with the armor for them I give a 4 out of 10. Just doesn't fit them at all.