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Juan, the only proof I can give you is the spec list for the new 50H72 @ Best Buy. You'll notice that the set still upconverts 480i to 540p, but leaves 480p alone.

You may, like me, want to wait a couple of months & get the 57H82 (June/July) or the 57HDX82 (Aug/Sept). The new sets do 480p natively.