I really liked everything that was said about Revan, and I wasn't so dissapointed by not "seeing" Revan, except that, the whole real sith lord thing. The Markos Ragnos thing made me a little irritated too, but I guess you can just call it a sith being high on the other sith.
As for Revan they sure seemed to atleast promise some sort of explanation of Revan and even the exile if theres a Kotor 3, it would really be weird if they didn't