No perks in the game, from playing it so far, I see no problem with everything being stock so far, guns are balance (lolIW/Treyneedstolearnbalance), each class is design to do its own thing.
Assault - Well.....yeah....<.<, get a assault rifle, side arm, nade tube, and ammo drops, which when you get good enough and such, you can rape a entire team without ever running out of ammo, just mind the reloads
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Engineer - Anti Tank class, SMG, side arm, Rocket, and a tool for either repairing your teams vehicle, or destroying a enemyes. Combine the dart gun (laser targets for rockets I believe it was) with your rockets, and shit dies.
Medic - Didn't touch this class, get a LMG, side arm, I believe its a health drop, just like the assault's ammo drop, and a deflib, which raises dead teammates, no timer, its instant, I've died, went to scratch my head waiting for the respawn timer, and get revive in half a second in order to die again, so watch it
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Scout - Typical sniper class, Sniper Rifle, sidearm, C4/charges for tanks, and this I thing is unique, a little ball that you throw and beeps when a enemy is in range, in this game, it IS wise to camp as a sniper, just be sure to be a alert and try to get headshots
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They all get 1 nade as well. :O