I want to say my ideas.
1). Professional and Standard edition, What does it mean?
For me, a Standard edition is for "playing" , and the PRO edition is for "flying".
In Standard Version:
a). Common Aircraft's like FSX.
. Normal scenery
c). Normal flight system
d). Normal Interface
In PRO Version:
a). NO Aircrafts! only just one or two good designed.
. A professional weather engine. Not like FSX or FS9. Real Turbulence, predictable forecast (like where is going to rain, or accurate wind-shear simulation). METAR interpretation and random weather generation