The only Earth Lantern shown so far is Hal, being the main character, so it's not clear if Guy, John & Kyle even exist, but Kilowog is the other main GL with Hal & RL Razor. Other GLs shown have been Salaak, Iolande, and Mogo. As for the other corps only Saint Walker has been shown as the first blue, the Star Sapphires, including Carol for a bit in one episode, but I don't want to give too much away, and of course most of the reds.
Oh, I forgot that they've hinted at the yellows with these yellow crystals that block the powers of the green rings in a few episodes, but that's it. No appearences of Parallax or Sinestro or any of the others yet but I'm sure all the rest will show up eventually as the series progresses.