Zenyatta
Mercy
McCree
Hanzo
Tracer
Symmetra
Reaper
Torbjorn
Reinhardt
Pharah
Winston
Widowmaker
Bastion
Zarya

The only class that has me interested from all of those videos is Pharah (rocket launcher class). I hope Zarya turns out to be good too (LG/grenade class).

Still not sure about this game but its looking like it will probably be extremely successful