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This is great. It's interesting how two very remote dwarf planets with widely different orbits are so close to each other right now (90377 Sedna and 2012 VP133).

EDIT: On further thought, I noticed another kind sorta nearby. I wonder if this is just a matter of looking for them in that area and that there could be a lot more that are undiscovered?

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Your edit is spot on — there's a lot out there in the Kuiper Belt / Oort Cloud that we don't know about. It's hypothesized that there are many objects out there, with more mass than in the Asteroid Belt. It's no coincidence that the ones we know are all near their perihelion currently.

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