It looks as though we'll actually be able to zoom down into the body of a legendary hero of the age and join your troops to fight and use special powers available only with the heroes. We're assuming that the whirling bit of sand in the video is a demonstration of this power.
That right there might have killed it for me. But that is an assumption from IGN. How many generals fought in every battle just like Alexander the great did? Then again look at the power of RTW's generals. I'd tone them down in unit size but that'd only hurt the A.I.