The New York Mets have added SP Zack Wheeler, newly acquired RP Greg Burke, minor league RPs Gonzalez Germen and Hansel Robles, SP Darin Gorski, and SS Wilfredo Tovar to the 40 man roster in order to protect them from the Rule 5 draft.
This means SP Chris Schwinden, IF Josh Satin, RP Brad Holt, 3B Jefry Marte, and 3B Aderlin Rodriguez will be available for any team to pick up.
(I highly doubt anyone is going to take Marte or Rodriguez as both players are still very raw and at least 3 years away from being ready. A team like Miami or Houston may take a swing at Schwinny or Satin. Holt was exposed last year and no one took him so at this point I dont think anyone likes him.)