Interesting tidbit: the producer and director of that movie discussed during lunch at a rooftop restaurant of a department store in the famous Ginza distrct how they were going to "destroy" Ginza when the monster rampaged through. Somehow, somebody else at the restaurant overhead them, and when the producer and director tried to leave the store they were detained by the Tokyo Metro police for several hours! (Oops.)
I’ve had the original film (subtitled) for many years now.
This is just another high profile re-issue to synch up with the reboot (yawn another reboot).
There are also some theatrical screenings of the original planned this summer. The write up I saw claimed “unseen in America” footage. Don’t know if it is on my DVD or not.