Unlocking factions in R:TW was not a problem, because winning a game as a Roman was a piece of cake.
There's been some speculation on what the five starting factions are. I'm sure somebody's already mentioned the five factions listed on the official website, which look like the frontrunners:
Byz (Greek Orthodox)
HRE (North European Catholic)
England (North European Catholic)
The Papacy (South Europeand Catholic)
Egypt (Islam)
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I think the purpose of the "unlock" features is to keep a new player from picking some faction he likes for outside, historical or sentimental reasons, then getting clobbered. People with bad first impressions rarely get addicted.
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