Chelsea are gonna lose at home, at least from that match that was what i gathered, because they simply cannot play 2 legs sitting 9 mean on the edge of the box or if they do it will be extremley disappointing, towards the end of the game when Chelsea actually started to play upfield a bit their defense was getting nicely outplayed by Barca's attackers because their defenders simply are not good enough to contain Barca's attack force.
At Stamford Bridge i say 3-1 Barca and anyone who says its impossible to score 3 goals at the bridge i shall just point you to 4-4 with Liverpool.
Also bringing Lampard off was definitely a good sub as he was doing completely fuck all for the period he was on.