He says he wants to remake Daggerfall... That sort of implies that High Rock will be accessable as the city is on the opposide side of that province to Skyrim.
He said he'd like to see the city redone, as in they didn't do it properly before. That does not mean they are going to have it in Skyrim. That wouldn't even make sense.
It also doesn't mean they'll ever do it again. It's just him talking about what he would like to see, not what they are actually going to do. I'm sure if you could sit down with Todd and asked him about what he would like to see in future Elder Scrolls games he could talk for hours and hours, but not all of it would end up being done.