How will races be balanced?

[Boltersam]

It's a simple question that may have been answered before, but how will they be balanced? Covenant tech is far more advanced than humans, and they have more numerous powerful ground troops by way of Elites. How will the UNSC combat them in naval combat, and without Spartans? The flood are another matter entirely, and would probably be the most balanced, though infection forms might be a bit strong if they can instantly infect NPCs and possibly players.

And a side note, will hand to hand combat differ from regular SS13's? And how?