Like has been mentioned above I don't see how this deviates that much from the story K1 told. Revan did disobey orders in going to fight the Mandalorians...and we knew that Revan and Malak encountered something that caused them to fall to the dark side and return as invaders. So really what they've done is set the Sith emperor as the reason Revan set about dismantling the Republic but leaving major portions of infrastructure intact. It actually makes sense to me...why would the Sith want to rebuild from the ground up when they could just wipe out military and political obstacles while leaving things the new empire would need.
At any rate, can't say this really changes my opinion on anything. I will still play the game when it comes out (and hopefully before then if I can get into the beta)
"You'll find that many of the truths we cling to depend greatly on our own point of view."