I'm gonna assume again Proto meaning "Prototypes" the sketches and designs/tech they couldn't use at the time due to manufacturing/engineering limitations,
"Tro" meaning Re-Tro" a re-imagined/ re-engineered shoe. It will look like the originals but have new tech. Like flyknit, flyweave, react foam etc..
Kobe probably wants his line to surpass anything on the market. By using the latesest and greatest tech Nike has invented or innovated in recent years and what they have tucked away in their patent portfolio.
Sounds expensive to me hopefully nothing to crazy like a $300 shoe.