Guest passes won't be available until after launch. June 3rd.
If you are itching to try out the headstart.
Head to gamestop, buy a preorder - 5 dollars down.
On your receipt they give you the preorder/headstart code.
This will let you play with a grace period until June 5th @ midnight (heading into 6th).
You can then decide if you want to go to GS again and pick up the full copy, or just uninstall.
This post was edited by Mangix on May 30 2014 08:18am