I got emailed a beta code a few days ago but it doesn't seem to work for me. I'm pretty sure it's actually for another region (region 1 as the emailed mentioned when the store updates on the 20th to use the code then. In the EU it's the 21st so the code will not work for me) I have PS+ so I got the beta today anyway without a code.
If you are interested please post and I'l PM you. It will be first come first served but not for new accounts made today etc .