I don't think we'll make a trade before the season but of course you never know what will happen.
I am not terribly worried about losing Posey when we have a slew of young talent all with the potential to step it up. No one quite replaces Posey's defense at the 3, but I could see any of Powe, BBD, TA (if signed), Pruitt, Giddens or Walker making a big splash this season. The C's don't have to replace Posey with a carbon copy in order to repeat, they just need to make sure that there is bench balance on 'D' and a couple guys off the pine who can nail the 3 (I hope they sign House). I see bigger roles for Powe, BBD and possibly Pruitt next year, and if both Powe and BBD are solid, the C's may have some trade bait with one of them come mid-season.