yes
The first sport that will be featured in the 2012 Olympics is Women's football.
Football
According to the events schedule on the official London 2012 Olympics website, the first sport to take place at the 2012 Olympics will be women's football, which will begin on July 25.
No, American Football is not an Olympic Sport. It would be fairly hard to become a new sport in the Olympics considering the schedule the teams/players/coaches go by.
No, golf will not be a sport in the 2012 Olympics.
football
Gymnastics is a summer Olympics sport not a winter Olympics sport. Gymnastics will next be in the London Olympics in 2012 and the Rio Olympics in 2016.
BMX
It depends on what you define the most common sport in the Olympics as, football is probably the most played sport that is included in the Olympics
football and womens football
Golf and Rugby will be the newest Olympic sport at the summer Olympics in London in 2012.
Gymnastics is a summer Olympics sport not a winter Olympics sport. Gymnastics will next be in the London Olympics in 2012 and the Rio Olympics in 2016.