Much to my disbelief, i passed the aptitude tests and did day 2.
Day 2 basically involves team exercises and group discussions followed by an informal interview.
At the end of the day they give you a debrief on how you've done overall and let you know weather or not they think you will get through to stage 3 (final interviews).
This obviously means that when you get your confirmation by email you already have a pretty good idea of what its going to say.