Polls are suggesting that Wilders has fallen behind Rutte since last week. It's likely that Wilders will remain as the head of the opposition, a role he seems most comfortable with. That and no other party would be willing to work with him, even if he does turn out the largest.
My predictions are that Rutte and his VVD will remain the largest, he will remain PM and will seek a coalition with the centrist parties, D66, CDA and perhaps even the Greens.