In case anyone has been living under a rock for the last 2-3 days, here's the news of the year: DNF 2001 playable beta build has been leaked and it's apparently more than just a few "empty test levels". For an easy instruction on how to download, install and run it, I'd recommend this thread on Twitter: https://twitter.com/EduardoBruwurbs/status/1523899417551642624
Actually it takes about 5-10 minutes to get the thing running, which is a nice surprise :)