It didn't happen that way at all. First it's fire breath was much, much deadlier. The fire stuck to me and to the ground, so when I ran through a patch on the ground I got set on fire. It got two consecutive fatalities on me when I tried to melee it. It also did serious biting damage. So I tried to use a bow and stayed behind a big tree stump and sniped at it. It worked but I got through about twenty vigorous health potions.
It was awesome. I'm going to have to seriously reevaluate how I deal with them from now on.
I was still slightly disappointed that it still only used one shout, but it was a huge improvement.
I was wondering if regular "dragons" have also been beefed up.