I hope that when Day of the Tentacle is remastered, all they do is clean up the audio and very gently increase the native resolution of the game. Because to mess with this kind of art is to mess with pixel perfection.
I mean, just look at this.
You can't improve on that. Best-case scenario, they just blow everything up to 1080p and clean up the rough edges. Worst-case scenario is literally anything else, up to and including trying to reinterpret the art, ala the Monkey Island Special Editions.
All pics courtesy of nuerotech's ever-wonderful Lucasarts background archive.