"A cavalry charge can only succeed...

[Volcano Man]

So if we get any east front titles, understanding the mechanics of the cavalry charge will be more important than in F14.

which in game terms it means simply that their assault value will be higher than their British and French counterparts, doesn't it?

No, not really. It just means that the map is larger in respect to the forces involved (lower unit density) and that there are more cavalry in general. The Russian cavalry on the East Front wasn't all that great actually but, as with everything, quantity is a quality of its own. But that is just all speculation -- no one knows what the next title will be. ;)