He absolutely does NOT strike me as an attention grabber, so it's not as if he's smiling quietly to himself knowing that we're all hanging on.
I suspect if he knew he was returning to Purdue that he'd simply announce it and be done with it. Since that hasn't happened, I'm guessing there are either still continuing discussions or that he's decided to remain in the draft and will quietly let the deadline pass.
As he and Barnes have said all along, it's a business decision, not a social media blitz.