I know the Terran have MULES which double the rate of mineral gathering than a SCV but only have a limited life span. Question Is what do the the Zerg and Protoss have? I know a read something about the Protoss having building that if placed near mineral patches would give probes more minerals per trip; or has this been removed?

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Q u o t e:
Protoss have the uhhm. Pylon thing that makes Probes collect more minerals for a while when you cast it's spell.
Man I forgot it's name, but whatever.

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Argus link ability that you talk about was taken out in the current build and is not in the game.

Keep in mind that at the moment Orbital Command not only allows the player to call a MULE for 50 energy, but also has Scanner Sweep and Extra Supply abilities that cost 50 energy each as well. This means that you have to choose between spending your energy on getting more minerals for a short period of time, scanning your enemy to gather intel or to get Extra Supply and get more units fast when you forget a Supply Depot for example.

Keep in mind that we try to make all 3 races as distinct as possible, so it is not that each race has to have something similar.

You are both right :)
I referred to the wrong name. Photon Charge was removed in the previous build and so was Argus Link.

This means that both of them are out in the current build.