M66 Quick Detailer has been around as long as I can remember.
It's often times confused with the Consumer spray detailer called Quik Detailer with the spelling of the word quick being different as well as being completely different products.
"Quick Detailer® is a one-step cleaner/wax specially formulated for high-production reconditioning. Quickly and safely removes oxidation and blemishes. Restores deep gloss and provides a durable wax finish."
You must have seen that at another store where it seemed to be a new product, and was described as "Megiuar's Professional Quick Detailer AIO", so I quick (no pun intended) looked it up...and saw it was #66...which as Mike says is an "old" product, I guess it's just "new" to that store.
When I was interested in trying a Meguiar's AIO, I looked into both M66 and D151. As I understand it, D151 is SMAT while M66 is DAT. I chose D151 on the logic that SMAT offers more flexibility in working time and would be more adaptable to D/A use. I've only used my 151 a few times, but I don't regret my choice.
This is the pro version of ColorX. Good stuff for quick clean ups, I really like the look it gives, but will only last about 4 weeks until it starts to give out.