Mounted Combat will let you fight with melee and ranged weapons, but you cannot cast magic. Although I'm sure some modders will be hard at work to let players cast magic while on their horses on the PC version. If you would like to check out all of the information on it head on over to the Bethesda Blog post, which also has the 1.6 changelog. Bethesda is still working on their Dawnguard DLC, but they may hold off till E3 to show anything on that. Thanks for reading If you would like to see combat in action you may check out this video below that IGN put up today.