But that's where you're wrong.
They did the remaster BEFORE they did the SE edits.
I own an original edition remaster box set.
The box for that release looks like this, if you want to scrounge one up at a used video store...
That's the first movie. The style of the other 2 is similar(Empire features a stormtrooper helmet and the walkers attacking Hoth, and Yoda, and Jedi features Yoda and the Luke/Vader lightsaber duel. All 3 boxes are black.).
And just so there's no confusion, it says on the side of the trilogy box that it was digitally remastered, as well as along the bottom of each of the 3 individual tapes.
Personally, I am of the opinion that the DVDs will likely have both versions on one disk, because it's well within the technical capabilities of the media and because inclusion of hte original version is a highly-requested feature.