Yes, the Simitar discs do have the advantage for the widescreen Godzilla since they are letterboxed.

It wouldn't make much sense for Classic Media to re-issue the Godzillas pan-and-scan again--there's be no point to it. So I'm cautiously optimistic that they will be 16 x 9 widescreen, and they did strike a new deal with Toho, so Japanese versions might be included for all of them.