"This map is currently very early in development, and we’re aiming to bring it to both PC and Xbox One this winter. Expect to see some new mechanics built around the snowy terrain. Soon we’ll also have more news about our fast-approaching third map, Sanhok. We’re proud to announce that it’ll come to PC on June 22, and to Xbox in late summer 2018."
In addition, the most recent Steam update provides some detail regarding the game's newest item – the ballistic shield – which allows players to set up cover in places of exposed territory. If you would like to see the full list of announced made at E3, check out this handy Steam article.