Marius, there was no rule change. All this confusion was created by the FIFA guy that Piney contacted who misinterpreted the rule as it is written rather ambiguously. The reality is that in FIFA and UEFA competitions, the away goals rule has always counted in the extra time of second legs - it's unfair, but it's the way it's been for a long time and is unlikely to change.
The way to understand the rule is when they say for extra time "if the scores are still tied" they mean if there's no winner and a team scoring more away goals (they clearly set out that away goals rule is the number 1 tie-breaker before explaining the extra-time scenario), then the match goes into a penalty shoot-out. Poorly phrased, but has been the practice for a long time now.

