The New Essential Chronology set most of the canon, I think. It established Revan as a light-side male, and The Exile as a light-side female. It also established Jaden Korr as a male (though did not yet specify his species).
All The Old Republic: Revan added was some specific points on his appearance and what happened afterward. And all the appearance points can be discarded, since people look different over time (hair color/length, etc.)
I've been playing TOR, and there was a great easter egg regarding the clan of Revanites on Dromund Kaas.
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Their Master was a woman, and when you tell her you thought The Master was a man, she says that the records specifying Revan's gender are spotty and unclear.