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.
Click here to see the hidden message (It might contain spoilers)
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.
"I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain."
-Bene Gesserit Litany Against Fear