This was confirmed on the company's official blog. They didn’t want to comment on the timing but they said that as long as you own Wolfenstein: The New Order, you qualify.
If you got the Wolfenstein game through digital channels such as Steam, PSN or Xbox Live, you will get the beta automatically.
The beta comes for Xbox One, PlayStation 4 and the PC. Those who have the hard copy of the game will have to register to get the access to beta.
The official release of the next Doom game, which will probably have the catchy title Doom 4, is expected in spring of 2016. The gameplay that was showed at the E3 looked awesome and fun to play. We saw some innovation in the gameplay and especially in how they kill the opponents.
Some of the humiliation moves might become popular in the multiplayer, especially for Twitch and YouTube Peeping Toms who just like to watch.