Whether or not Windchargers will be problematic will depend heavily on their attack profiles and any add-on abilities. That said, if they remain largely the same as they are now, the "ignore ward" ability will make them useful, but won't make them OP. LRL players quickly found that Windchargers weren't worth investing heavily in, and I don't see that changing. Having 5-10 in a list may now be worth while, because they present a quick unit that can threaten key heroes or chip wounds away from otherwise tanky opponents, but I can't imagine that players would want many more than that. They're fairly fragile and their damage output isn't exceptional.
Besides, unit point costs are going up across the board this edition, and ranged unit points are going up more than most. I imagine they won't be a cheap option.