This is a interesting question. Conventional wisdom would be to trade him. He's a 35 years old UFA who most likely isn't apart of the team's future ( my definition of team's future is a player who will be part of the team in 3 years to come and will have an active role). However there are some compelling reasons why we should keep not only at the deadline, but maybe even a short term contract as well.
There's no doubt that 2010-11 was a terrible year for Filip Kuba. He got injured in the first day of training camp, and never quite caught up. He finished with 16P and an ugly -26 in 64 games. It can be argued that Kuba's bad year was more of a result of being on a terrible team than evidence of his play deteriorating. His play, as well as the team's overall play, improved in the last quarter of the year.
2011-12 has been a completely different story. As of today, Kuba has 22P (5 goals) and a +18, tied with Zdeno Chara and Pavel Datsyuk for 22nd in the league. He is 32nd in the league in avg. TOI (23:30) and 9th in the league in avg. SH TOI (3:31). He's on the 1st pairing with Erik Karlsson, and often, if not always faces the top lines from every team. THe argument could be that Kuba's high Plus-Minus is a result of being partner with the highest scoring defenceman in the league. However, Karlsson's success is in large part due to Kuba steadying influence in the back end, which allows Karlsson to take more chances offensively. Next year, 2012-2013, we have 4 defensemen under contract: Phillips, Gonchar, Karlsson and Cowen. Hopefully Murray will actively look to sign a top level defenceman, but those are few and far in between.
So I ask you, what should we do with Kuba? Should we trade him while his value is high? Should we keep him for the rest of the year, and risk losing him in free agency for nothing? Or should we look to sign him to a short term contract?