What If I was in charge of the 10 min Handover Segment:
Alessandra Ambrósio enters the stadium carrying the Flag of Brazil:
Execution of the Brazilian National Anthem with fireworks at the end (a little camera close at Dilma Rousseff):
While the anthem is been executed, an impressive landscape of Rio is build up in the center of the stadium, like a large scale model, and the Copacabana pavement covers the track & field area (thanks Ikarus). After the anthem and the fireworks, the lights go down and this music starts to play:
Both singers appear at the top of the Sugarloaf mountain (he playing piano, she laying on it with a glamorous white dress), and the whole stage is lit with yellow and white (the crowd would hold lights creating the atmosphere of the night sky). Like on "Fantasia 2000", wave-shaped screens would fly on the Stadium showing pictures of Rio and Brazil while the song is been played:
After that, the extravaganza begins with some samba/pop with lots and lots of dancers, which would go something like this:
Several dancers flying the stadium by cables. However, instead of Jamie Foxx and Will.i.am singing "Hot Wings", Vanessa da Mata could emerge in the landscape singing this song:
The whole stadium is lit with an amazing color show and fireworks, with the dancers and stuff that I said. Perhaps, several Brazilian celebrities could appear dancing in this huge party. Then, Vanessa da Mata climbs the Corcovado Mountain and open her arms as Christ the Redeemer, there is a great firework finale and everyone appears cheering.