Update: More ways to Beta access here
This is a closed beta key, stocks are limited so act fast!
1. Go here & create an Alienware Arena account if you don't already have one
2. Go here & login
3. Click "Get Key"
4. You will receive the key in your e-mail inbox
5. Go here & redeem the key
6. You will receive the Steam key on October 1, 2015
G2A: Rake In The Falling Prices Games Sale - 3% off voucher: KINGS
GMG: VIP Deals (Sign-In Required)
Cities: Skylines Deluxe Edtion Deal - 20% off voucher: 20PERC-AUTUMN-SAVING
Rockstar Games Bundle - 20% off voucher: 20PERC-AUTUMN-SAVING
Rockstar Games Titles Deals - 20% off voucher: 20PERC-AUTUMN-SAVING
Mad Max Deal - 40% off voucher: MADMAX-40PERC-BUYNOW