I can garuntee you all that Capello will not use just Emerson as a lone defensive midfielder. He will use Emerson much like he did with Roma, as a roaming central midfielder. Also, like he used Dacourt as a defensive midfielder, he shall use Tacchinardi. So Alessio will be the holding, defensive middy, and Emerson will be able to contribute to both aspects of the game, specifically roaming on the edge of the box using his incisive passing ability. Nedved shall be roaming around the box as well, with Oddo, Zambrotta, and Jankulovski (or Cesar) running the flanks.
My line up again:
Buffon
Oddo - Thuram - Cannavaro? - Zambrotta
Emerson - Tacchinardi - Jankulovski(Cesar)
Nedved
Trezeguet - Del Piero
Capello said he would use Zambro as a left back again, but if he doesn't:
Buffon
Oddo - Thuram - Canna? - Jankulovski(Cesar)
Zambrotta - Tacchinardi - Emerson
Nedved
Trezeguet - Del Piero
I like Jankulovski better in a more attacking role, so lineup #1 sounds good.
