More details about the game will be revealed each week in the run up to launch.
The letter also talks about a new weekly update the devs have planned over on the letter's page, which will reveal more details about the game and talk about the "big and small" changes they have made "to make Hardline a complete FPS experience."
"There will be another MP beta for all platforms that will showcase a small slice of the game and will also help us continue to test stability as we prepare for launch," wrote Visceral Games' manager Steve Papoutsis.
Since the first beta last year the developers have used a lot of the feedback to improve the main game.
"There's no doubt moving the game back was the right call. The improvements the team has added to the game with the extra time are making Battlefield Hardline the complete first person shooter experience we set out to deliver."
Battlefield Hardline is due for release on PS3, PS4, Xbox 360, Xbox One, and PC on 17th March in the US, and 19th March in Europe.