Okay, let's speculate.
I think that KOE is going to have all of the planes in WFP and more, and they will all be flyable.
I think that KOE will allow campaigns to start in early 1915 and progress to the end of the war.
I think that KOE will allow for seamless transition from two seter to scout, allowing the player to take the same career path as many famous aces.
I think that KOE will correctly model all of the quirks of WWI aircraft, including rotary engines, wing warping, and frequently poor aeleron design.
I think that KOE will have the best AI ever seen. It will run away when damaged or out numbered. Two seaters will abort if the situation is bad, etc. However, it will also model some human failings. For instance, you will be able to sneak up on it.
I think I need to stop dropping so much acid before visiting these boards ...