I've only seen highlights, other than World Juniors until this series with the Soo. He's unreal, his speed is insane. If he can bring that same game to the NHL, there is no way he won't be a top 5 player in the world in the matter of 3 to 5 years.
As for trading him, to me it would take a boatload, but as good as he looks, he is still a junior hockey player who is unproven as a PRO. If the right deal came along, such as...
MON - Subban and Price.
or
OTT - Karlsson, Lazar, and Turris.
or
NSH - Weber and Josi/Jones.
or
LA - Doughty, Toffoli, and Jones.
or
FLA - Barkov, Bjukstad, and Ekblad.
or
BUF - Eichel, Reinhart, and Risto.
or
WAS - Backstrom, Wilson, and Carlson.
or
STL - Tarensko, Pietrangelo, and Allan.
or
DAL - Seguin, Benn, and Klingberg.
or
COL - Mackinnon, Barrie, and E. Johnson.
or
ARZ - OEL, Hanifan, Domi, and Duclare.
These are the deals that would make me consider trading Connor, some seem like no brainers, some are still a little iffy. One thing is for sure, not many teams, if any, would be willing to pay the asking price to acquire him.