Out today (April 2) on all platforms, the '1939' pack features two new maps - a World War 2 bunker called 'Dogfight' and a hunting ground named 'Forest Meadow'.
Next month will see the release of 'Shipwrecked', adding the 'Lost Fleet' map - featuring a massive beached ship - and 'Himiko's Cradle', an area set in a mountain-top shrine.
Before anybody buys this pile of crap they need to be aware that the new maps are only available in Free For All matches only. I don't play that game mode at all. They conveniently withold that information from you until after you purchase the add-on. I only play team based matches so I'll never get to see the new maps I paid extra money for. Shanty Town is another map only available in Free For All matches.