Are we gonna see things like condensation trails & flourishes over the wings ect? Small details, but it adds ALOT to the feeling of really flying a vehicle thru the air, at least when you see that.. it looks damn cool. I hate the feeling of flying a simulation and it always feels so 'sterile' sometimes because of a lack of small touches like that. Is it essential? Nope but I honestly dont think it takes that much effort to implement either for a nice pay off.
Look at Ace Combat 5, yea it sucks and its an arcade game..but they NAILED things like that, and the feeling of flying in a thick atmosphere (clouds/vapor/mist) todays modern CPUs should have no trouble with this.