Corey Pronman released his latest top-50 drafted prospects list today (insiders only):
http://insider.espn.go.com/nhl/story/_/id/12161713/william-nylander-tops-ranking-top-50-drafted-prospects-nhl
He ranked Nylander #1:
1. William Nylander, C, Toronto Maple Leafs (previous ranking: 4)
Current team: Toronto Marlies (AHL) | 2014-15 stats: 21 GP 8 G 12 A
DOB: 5-1-96 | Draft: No. 8, 2014
The top group were all close for me, and I would not say that putting Nylander No. 1 was an easy call. I leaned toward him because he stands out. His skill level is unique, his play in Sweden this year has been unique, the way he weaves through the neutral zone and gains the blue line effortlessly is unique. He's by no means a perfect player -- he has to improve his play off the puck and get a lot stronger -- but the upside is quite tantalizing.
Reinhart, Ehlers, Bennett, and Domi rounded out the top-5.
edit: Should note, "prospects are considered "graduated" if they have more than 25 games played this season in the NHL, 50 career NHL games, or are currently on an NHL roster. Thus, players like Mikhail Grigorenko and David Pastrnak are considered graduates."
Ekblad and Draisaitl considered graduated too.