I'm pretty sure the Asari, Salarian, Turian and Quarian/Geth homeworlds have been confirmed as mission destination in ME3. Nothing I've read mentions either the Hanar or the Volus homeworlds (nor the Elcor or Batarians when it comes to that.) And yes, Tuchanka (sp?) was indeed to Korgan homeworld. Aside from being in the codex, it was explicitly said several times in dialogue.