Depends on what you find 'a lot'
For example, Malak's complete background is explained. How he got bald, tall and got the Malak name.
For Revan...more mystery is given. You see he is already (at a young age) involved with big Jedi Masters and probably knows of the Jedi Covenant. Some other quotes from K1 and K2 are explained as well.
So...it's subtle. Nothing more.
"I think the Devil ****s Dutchmen."