Eh.. what indications? Obsidian made it so that the player early on in KotOR II determines whether Revan was male or female, good or bad - so that you can replicate the environment from the first game.
Though officially, Revan actually appears to be male. This line is taken from the Star Wars Chronicles from KotOR II's official site:
Here are my reasons for thinking Revan is female and the Exile is male:
At the beginning of KOTOR II, Atton states that Revan is female and the Exile agrees or disputes that Revan is a female, rather than the other way around. Another reason is the very powerful scene with Carth at the end of KOTOR II. Apparently there is a similar scene with Bastilla, but from my understanding, it does not pack the emotional wallop that the Carth scene does. I