The 40-man roster balanced out, with David Aardsma, Tim Byrdak, Pedro Feliciano, Frank Francisco, Aaron Harang, LaTroy Hawkins and Daisuke Mastuzaka becoming free agents.
Teams have a five-day window to make a qualifying, one-year, $14.1 million offer to their own free agents. The player has one week to accept or decline the offer. If the he turns down the offer and ends up signing with another team, the former club is entitled to draft-pick compensation.
There is no evidence that Sandy Alderson intends to make a qualifying offer to any of his free agents, though I do think the team will eventually make a lesser offer to Hawkins, who has said he is open to coming back to Queens.
It's worth noting that the Mets are going to want to add players to the 40-man roster needing protection from being selected in the Rule 5 Draft, which needs to be done by November 20. So, at some point in the next couple of weeks, assume another round of cuts (or a trade or two) as Sandy Alderson finds ways to make space.
For more on the 40-man roster crunch, read this post from Michael Baron.