Getting a theatrical version of ESB in HD would be a monumental effort I reckon. Some of the shots are digitally altered e.g. Lando and Leia running through Cloud City. These could be retouched to remove the SE effects. Some shots don't exist in HD at all, e.g. parts of the Wampa's cave scene and when Lando announces the Imperial takeover of Cloud City. These shots would be incredibly difficult to reconstruct in HD. Moreover if you listen to Adywan's youtube interview he says that removing one of the rontos in Mos Eisley in ANH:R was one of the most painstaking changes he had to make. So even any digital retouching would be hard work.

All things considered unless Mr Lucas releases the theatrical versions in Blu-Ray format I don't think we'll be seeing them in HD ever. At least we have probably the best theatrical version of ESB on DVD right now.

Lord__Vader said:

Correct me if I'm wrong but IMHO as most people now have HDTVs, that means they will be watching this upscaled to HD anyway, only the quality of the upscale will be worse than if it was done in a computer. But I see your point, the LQ elements probably will stand out less, if the quality of the rest is also lower.

That's not a safe assumption, not everyone is loaded enough to be able to afford an HDTV.