I have great expectations, but I think the deciding factor will be the price tag.
There is a huge number of Warhammer Fantasy players with existing armies, and they are (or we are, although I sold my armies long ago) missing the feeling of that game, the rank-and-file units, rear charges, the magic, and so on. For some reason Kings of War did not brint the same feeling. And although the 9th Age (an unofficial WFB 9th edition) game is well alive and kicking, without a company promoting it and releasing miniatures, it is hard to get new people into it. And both games are really just the same old stuff again - move your entire army at once using a ruler, roll a handful of dice, remove models, count casualties, roll for morale. Please note that I don't miss the old WFB rule mechanics, only the feeling of the games :-D
If Runewars will have a system that is modern and traditional at the same time (and so far the demo videos seem to suggest this is the case), and the game gets good support, multiple armies (6-8 at least in 2 years), a lot of people could get really interested. And some of them will think "why should I buy more miniatures when I have a 3000 points Vampire Counts army"? Others will think "why should I buy these spearmen for X bucks when Mantic sells them for X * 0.8 bucks?"
So the pricing for the unit boxes has to be right to get those people to buy the boxes (even if just for the cards and dials, selling the minis themselves) and play the game. If that will be the case, the game will be a huge success I think.