Aion, before its September 22 release, a recent press release has announced two methods of doing so. The first is probably the more noteworthy option -- the game is going into open beta for one week only starting Sunday, September 6. The sneak preview will allow players from both of the game's factions to reach level 30, and lets them fly, fight and fly-fight through every locale from the full game.
The second opportunity to beat the release day rush is by pre-ordering the game -- those who pursue this option can pre-select their servers and character names on September 18, then start playing a full 48 hours in advance on September 20. Is the five-dollars-down worth the exclusive pre-launch access? Sadly, we can't make that decision for you. We can, however, tell you what to have for lunch: Nachos. You're welcome.