No, but I also don't see it as a dismissal in any real sense, either. WC3 will have always happened and remains formative to WoW in the general sense, but its specific story riffs (e.g. the Scourge, the Legion, etc.) don't always need to be the primary plot points for the future expansions. WoW's done a pretty good job of cultivating new ideas for lore, but the developers seem to believe a new cosmology is needed now that we've essentially mined WC3's idea pool pretty extensively.
Mind you, I'm not in full agreement on that score, either; I'm more explaining the reason behind why the developers said what the OP is talking about.