Battlefield 1's beta is finally live on the PlayStation Store, weighing it at a rather hefty 6.5GB. The client is completely free to download – you don't even need to pre-order or anything like that. It includes two modes: Rush and Conquest on the Sinai Desert map.
It's worth pointing out that your progress in the beta won't carry across to the final game, but if you hit Rank 15 (or play on each of the beta's four days), you'll unlock an exclusive dog tag in the final release. Cool beans, eh?