I read somewhere that if Duran went to the Olympics, he would not be available until mid August, August 17 , if I'm not mistaken. While a callup no longer seems as imminent as it once did, that's a long time not to have a player available. I don't think they are planning to trade him. They just want him to be available, if needed.
That said, Bloom's moves are geared towards the long term. If he can pull off a trade that will help us short and long term, he would trade Duran. I can't see him trading Duran for a piece that will only help us this year.