Yeah, I'm really worried for what they'll do in terms of changes, especially to Sylvanas, since she's most susceptible to this but there's also a risk the night elves get softened. The Kalimdor Horde are safe since Thrall was an extremely arch figure back then and he can't really be made more perfect than he was and Grom is a classic, the worst I can see being done is that they change some of the things surrounding Daelin, by making him sound more aggressive, changing the tone of his lines. In the original he is a deeply zealous person, but he's fatherly with Jaina, which is lost in his BFA rendition that makes him quite hostile. I have other voice concerns regarding the new Arthas and especially the new Grom/Mannoroth VA. The original Mannoroth VA has probably the best demon voice in the entire franchise one they haven't been able to match with all the filters up to now and the one in WoD just can't compare.
I'd be lying though if I said I wasn't really hyped for like a War of the Ancients campaign, or even outright WoW stuff. Hell, a WC2 remake with all the Chronicle and Tides of Darkness novel additions would be god-tier. Maybe mini-stories about the night elves joining up with the Alliance since we never saw that happen, or Warsong vs Night Elves 2.0. The sheer quantity and variety of models are a modder's wet dream and I can't wait for the kind of campaigns they'll make.