Fans asked, begged, pined for it for months, and now they've finally got it: Mounted Combat!
Bethesda has announced that, in addition to the patches that added Kinect support and new kill cameras, mounted combat will be coming, in the 1.6 update (which comes of course with plenty of bugs and fixes). This feature was previously seen in the Skyrim Game Jam video and, more importantly, will be absolutely free.
Mounted Combat will allow players to perform melee and ranged combat on their horse, which will make Shadowmere much more useful. And just in time for Dawnguard.
Those enrolled into the Steam Beta Update can check out the feature now, though Bethesda recommends that you back up all your previous saves from Patch 1.5.