Hold on a moment; this can't be the complete list. There has to be more missions on Earth because how else are we going to access King's Watch, the Jovian Complex and the Seraphim Vault? And where does Bunker RAS-2 fit in here? I really doubt that areas that big and closed off don't have any more significance than just explorable areas.
EDIT: For those of you saying it's DLC, I'm skeptical of that. The way the Expansion packs are structured, it looks like there's "Expansions", which seem to add story missions to existing locations (see The Dark Below), whereas "Comets" are the yearly additions that add new content. This doesn't seem to fit either of the ones that were announced, since no expansions were announced to take place in Old Russia.
Furthermore, we have a map of Venus that shows a few more story missions than what DestinyDB is telling us.