i believe each team only gets the right to amnesty one player from now through 2015-2016 and they already used it on Arenas.
This was discussed a couple of months ago, but I'm pretty sure each team is allowed 1 amnesty per offseason. You are only allowed to amnesty contracts that were made prior to the new CBA though.
Most owners won't be willing to have 17 players on their payroll when 3 off them aren't even on the team though.