He mentions certain free agents like former Ranger Bryan McCabe and Anton Stralman on defense and Sergei Samsonov and Steve Begin at LW.
Richardson also mentions that the Blackhawks could make Rostislav Olesz available as they are having trouble finding a spot for him in their lineup.
There are issues with all the players mentioned, especially McCabe who won't be back. Stralman is 25 and interesting but seems to be signing a contract with the Devils after a tryout with them. Olesz has a ton of talent and is only 26, but he has two years left on his contract after this one which makes him a stay away.
I think that it is too early to be thinking about trade candidates especially when the Rangers have a couple of more LW options they can try with the top line before needing to worry.