Little English Halo Blog spied a new character for the Halo verse when checking out some new Halo toys. Commander Thomas Lasky will probably be available as his own action figure upon release of Halo 4.
If you've seen the trailer for Halo 4 that features the Forward Unto Dawn being drawn to the planet of Requiem, it's not hard to see the Lasky is the Commander of that ship.
I imagine that Lasky will perform a similar kind of role that the wonderful Commadber Keyes played in the original Halo: Combat Evolved game. Let's hope Lasky is up to the standard that Keyes set!