Ryan McAvoy said:

Not wishing to end the debate but the wikipedia article on RMW (If you choose to trust it) states clearly...

"Recent Film Credits: Star Wars Trilogy – Restoration and 3D Conversion"

Should have checked Wikipedia earlier but that seems fairly conclusively to point towards this being part of the aborted 3D post-convert business. Sad face.

That was already the only logical answer, considering when it was done. The question now is what Disney is going to do with it; whether to go through with the 3D release, use the materials for an OUT Blu-ray, or do nothing.