The official website for PlayerUnknown's Battlegrounds, which will be leaving early access in two weeks, has revealed that from 11:00 CET today (10:00 AM) players should have received access to the new Miramar map on the test servers for the game as part of the first phase, lasting until December 10 at the same time.
Phase 2 hasn't been announced yet, but there are plenty of patch notes to look at if you're interested, including a redesigned UI for menus and the health bar, passengers being able to bandage, and of course the brand new weapons and vehicles that are introduced with Miramar.
Can this be an even better map than Erangel though?