The Libertarian Party convention on June 7 will decide the nominee. The candidates are:
Marc Feldman
Gary Johnson
Steve Kerbel
John McAfee
Austin Petersen
I believe Kerbel bowed out.
The Libertarian Convention is May 26-30 in Orlando.
You can check the candidate standings here. Looks like Gary Johnson has a comfortable lead.
Adam Kokesh (remember him?) will be speaking.