Oh yes, saw in a magazine that in multiplayer, you can play as every race

Basicly, choose a race, then kill people and you get points. As you get more points, you can become higher leveled units. I know its:
Terran:
Light Infantry - 0
Marine - 1
Firebat - 2
Ghost - 5
Zerg:
Zergling - 0
Hydralisk - 1
Infested Terran - 2
Mutalisk - 5
Dunno about protoss, it doesn't say. Also, the infested terran has gun usage and suicide

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On the other hand, I think not. Some people doesn't like to be a Firebat, and sometimes people doesn't want to become Light Infantry. Besides, how can that be possible? Light Infantry has the tools to detect and find ghosts, so how can the weakest beat the strongest? For the Zerg, I think it does need higher levels, but for Terran? I don't think so.