The Mets are still hopeful that they can sign Michael Bourn, but there are currently "no discussions" between the union and league about the draft pick issue, a source tells Andy Martino of the New York Daily News (on Twitter). The union, not the club, would have to file a grievance in order for the Mets to retain their first round pick.
If the union does go ahead and file a grievance, then they and the league would go before an arbitrator. The two sides could also settle in advance of said hearing, but nothing has been done to begin that process yet.