Goddamn, I love getting random shoutouts in these topics.
It's pretty much gauranteed that it's Darkseid R.I.P, since Big D should be dying in Death of the New Gods. Long Live the Real King is most likely referring to the original Aquaman making a return to glory.
The Red Lanterns was something confirmed by Geoff Johns a while back, and the general consensus is that it will represent Hate or Anger. Orange may represent Avarice, and Blue will probably be calm, or sadness.