Heroic quickness just gives you more AP, no ATK or DEF bonus, no additional attack. And no, it has nothing to do with spell quickness nor blessing, a simple, non-spell-quickened, non-blessed hero still just gets one lousy attack each round, period.
Heroic quickness definately gives multiple attacks per round- more than two, if its high enough. I don't have a savegame right now, but I am ninety-five percent sure that a vanadrott with heroic quickness 200 odd percent and a shadowbrand swung thrice per turn.
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OK I take back my words. I did get conflicting results. In one game, my fallen angel with 211% speed bonus only got one attack per turn (it has a frost band and 3-4 attacks per round is too obvious to miss). While the other test game with a priest (110% speed bonus) did get 3 attacks in the first round before it was killed. So I am puzzled here. Anyway, no ATK or DEF bonus, no games show that.