This morning, i opened my RSS Reader and while reading the news, i found an interesting article from LifeHacker, called Manually Enabling GMail Labs in Your Account. I tried the step and it does works. Now i have access to GMail labs and i can test those 13 new features GMail team is working on.
The only thing to do is open this URL (https://mail.google.com/mail/?labs=1#settings) after you logged in into your account. When it's done loading, you will have a new tab on your Setting screen. Congrats... you have your Labs tab now and you can start testing this new feature
Note: This doesn't work for GMail Apps according to the article, but i can't prove it since i don't use it.