Respawn Entertainment have responded by several opportunistic (scam) sites cropping up promising beta keys or early access to the upcoming Titanfall with a tweet:
"To help keep our fans safe from scammers, please note that all sites advertising Beta access are 100% scams. #BePCSafe #Titanfall"
Of course, you can be sure that when any proper beta information surfaces you will read about it here on Gamereactor.