There's northing too outright special about it other than the audio (head unit and subs) are Panasonic. The interior front seats have red cloth. Actual red cloth, not the black/red style of the GT. Though, the rear seats are standard cloth. And there are a few other accents, such as the shifter, steering wheel, and floor mats. There may be an upgraded battery and alarm system, but thats speculation. The body sports the TOYOTA Action Package, aka "TRD Aero." And there are graphics across the hood, along with a badge on the front quarter-fender with the words "Panasonic Toyota" on it.
The differences between the standard Celica version and of this Panasonic "special edition" Celica were so minor, that it was quite obvious it was a limited-run. And thats what made this variation's name reputation precede itself.
See attached photos