Hello and welcome!
Whenever I see someone write "Special Edition" with a car ad, I always get a little skeptical. Are you referring to
this car in particular? Looks like they wrote "Collectors Edition Special 22R-E" which is probably his way of saying the car is rare. It's more rare for a GTS to come with a twotone paint for sure. Otherwise there's nothing else special about the GTS other than what you already know.
The 22R-E's are pretty decent for what they are; single-cam, 2.4L truck motors. The torque is nice but you won't get much if you wind it out. That said, I've never driven a 5M-GE Supra so I can't make a comparison.