I mean, I haven't seen anything written anywhere to indicate what's said in the first NBA Draft Big Board of the year.
On March 17, Sports Illustrated published their first 2016 NBA Draft Big Board, as assembled by Jeremy Yoo. It has the standard preamble paragraphs: Ben Simmons & Brandon Ingram; lots of volatility past them; blah blah blah.
We scroll down to the #8 slot to locate Marquette freshman forward Henry Ellenson, and here's what Yoo had to say about him, emphasis mine:
Rumor has it that Ellenson isn't set on coming out this year, but as of right now, he's in the lottery if he wants to be.