Ok,,, let me analyse the situation (please comment on my analysis):
Goalkeepers:
There are Rumors that Cheminti will retire. meaning we will need a sub keeper. We have been linked lightly with Antonioli the ex-Roma keeper. Good one as a sub. Honestly Chimenti's spirit is irreplaceable.. All players love him.
So we might get Antonioli, or another Goalkeeper who is ~30 years old to be a sub.
Deffence:
Ferrara retired, Montero is Rumored to leave Juve this summer seeking first line participations outside the Serie A. I don't see Legro coming back (he really screwed up last year) Tudor has better chances because he has history with Juve. If Tudor returns we will need another CB with him. Rumors are saying that we already singed Kovac. Kovac and Tudor might be a good combination of sub CBs. Tudor is still young and Kovac just wants to honor and money that comes with Juve's jersey. If Tudor does not return we will need another YOUNG CB. I would vote for Paolo Cannavaro although Juve has been linked many times with Bonera.
Bonera can be helpful as a Side back as well as CB.
Side backs:
This depends heavily on Pessotto. If he is retiring we will need another SB. Chielini can return from loan for free, but I heard the Capello didn't like his deffensive abilities. This means that we will get him

...
DM:
With Appiah's current form, I think that all 4 DMs should stay and that we should not add another other player with them.
CM/OM:
We need a helper for Nedved. We have been linked few months back with Stephano Fiore. He is idea for Juve from the every way. Cheap, Serie A tested, italian, not old, creative, scores, and can play as a Centre midfield (emerson's position) and right wing.
Wings:
camoranesi, Muttu, Kapo all should stay especially because we want to fight for the CL. Olivera should go on a loan though or stay as a sub that plays in the less important matches so he can gain experience. Thats ofcourse if he can maintain his temper and manners.
Forwards:
We have the best .. so keep them
Coach:
Summary:
Out: Ferrara, Montero, Cheminti, Olivera (loan)
In: Kovac, Tudor/Bonera, Fiore
Costs:
Fiore: 2~3 million euro
Bonera: ~5 million euro