That certainly was the old plan, with the top and eastern areas of the zoo designated the Grasslands Biome but I've no idea where things stand with that masterplan since the land swap deal fell through. Here's one of the early concepts, though later designs were produced the basic layout remained pretty close to this:
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Sadly, I don't think we'll see as signficant an redevelopment of the whole site as was originally planned.
Though that masterplan would make for an amazing zoo, I wouldn't have seen the point in a tundra zone due to HWP. I would rather the zoo concentrated on the other biomes, either by adding another biome [desert] or expanding on another.