First off, I'd want the Dekus to return. They seem to be an earlier race, as Ocarina of Time is always set as the origin of a timeline (Child or Adult). Therefore, I want to see Deku Palace brought back,but in it's early stages, along with more characterization from them. They are an excellent race to expand on, in my opinion.
Another one I'm sure will return, unless the Goron is just a roaming sales, er Goron: Death Mountain. It was shown in the demo and concept art numerous times; even if it was in TP last, I want to be able to explore it in Hyrule's beginning.