Teleporter is pretty much an overpowered Thruster Pack. 343i had the idea to implement the Knight translocation ability into an Armour Ability, but it was deemed far too overpowered, so was replaced by the Thruster Pack.
What I wouldn't mind seeing is the Knight's sword. Once aimed at an enemy, you would do that weird zig-zag thing towards them. One hit would take away their shields, like normal melee, and then the next would kill them. It has a recharge time between hits and would mainly be used as a support weapon, like the PP, for shields.