I'm going to say this one more time..... THEN I'M TURNING THIS CAR AROUND AND WE ALL GO HOME! YOU WANT THAT?!?!!?
Beta access was given out on a random basis at the start with sys-specs being slightly biased.
Then we reduced the sys-spec requirement and went with pure random picking of players.
Then we started inviting random Founders members (veteran,elite,legendary all on equal footing).
There is no news on when we will start inviting more players but if you haven't been picked, it's not because you have an nVidia card. It's probably more like the fact that you have been unlucky like the other 200K+ members of the forums who haven't been picked.