How can you get video games before they come out?
1. Download them (Which is illegal)
2. Become a games journalist and you get copies of the game about a month before hand to review it.
What is the difference between regular edition and premium edition and collector edition video games?
Many times major video game corporations will have "testers" or people qualified in video game testing that are paid to come to a facility and just play video games for a living. Other people can go to events where games are shown for the first time and pay to play the game on the company owned systems and games.