This is an eficient and modern event advertised with fewer resources, but with high impact on public, and I am sure that people at Samsung have not exhausted here all their pleasant surprises, I look forward tomorrow launch!
In these conditions, it will be really hard for Apple fans to convince that their phone is the best, not with such a good marketing policy from Samsung competition. However, Samsung still has to be very careful and HTC, because it is a very strong competitor too.
The majority reaction to watching this flash mob was like: yes, this is high quality advertising, tomorrow I will be watching this event, as it deserve.
Best phone, best advertising, best selling! Samsung is the best!