[RoryF]

The best way to think of it is really that when LucasArts released the special edition Monkey Island games, those were HD Remakes/Remasters, the same game, updated art and smoother graphics in general with some other features without editing the core game.

This, on the other hand, is changing both the graphics, the design of the graphics themselves, as well as the new scrolling camera providing what we can assume to be a change of the gameplay itself. On top of that, it's more than a simple update of the graphics, the level backdrops have changed to accommodate the new 3D abilities (notably the lack of barrels so that you can see more of RuptureFarms' structure).

Essentially if this were a HD remake, I mean the graphics would maintain 2D like the original, but better rendered backdrops/character sprites (possibly a parallax effect for the backdrop), this is more than that; it's actual 3D.