There are four repaints in this first set, for reference. Quoting Peter Lee for a moment: 'I don't want to reuse old sculpts, but it was a necessity for these first two heroes sets. For you old collectors, you'll be happy to hear that there aren't any reused sculpts in the monster sets.'
The repaints are based on Aramil, Bonded Fire Summoner, Drow Sergeant, and Cleric of St. Cuthbert - all good sculpts, at least, though slightly surprising choices to me. I've looked at the amazon pics and unfortunately they're just far too low resolution and blurred by plastic for me to get a good feel for the new minis.
For example, compare this spoiler image of the Goliath (slightly different from the picture in the blister, check out the clothes color difference):
and the amazon pic for the hero box it's contained within:
