Yes, I wouldn't be surprised if we'd see a red card for a Juventus player and at least one penalty call for us. The pressure of the Camp Nou crowd usually makes the referee biased in our favour.
I expect a flawless game by our defence. We're going to press you high up the pitch, we won't let you have a lot of possession. Nevertheless Juventus won't really have much ambition in attack. They will come to park the bus and protect the lead they have.
EDIT: My money is on Barca to win the match (1.53). I will put 100 EUR on it.
Lets see
1) Your defence is far from flawless. In fact we tore right through with our unique attack.
2) you cant press high up the pitch. You pass the ball high up the pitch cause teams fear the frontline and sit back deep. Big difference. The moment we have the ball Khedira walks past the front 4 players. Thats not a press.
3) Juventus will keep its double defensive game, and will aggressively attack as soon as it gets the ball. Not counter, but attack, commit players forward, cause we can shred that defence and scoring in your stadium is the best way of defending this lead.
4) Barcelona could win the game. But they'll concede far to much to overturn the deficit.