The blu-ray discs will be the altered versions and not the originals. Back in the day, I was able to purchase the original trilogy in their original form, but the altered versions came with them, too. (I refuse to call them "enhanced" as that's not what happened to them, they were merely altered.)
In truth, the one thing done in Empire that I could have approved of would be the attempt to make Cloud City appear brighter with the windows and such, but it was crudely done. The set looks very artificial now, the digital painting of the effects are just too badly done.