https://www.gamespot.com/articles/play-call-of-duty-ww2s-multiplayer-free-on-pc-righ/1100-6456951/

Curious about Call of Duty: WWII? Activision is hosting a free trial weekend for the game's multiplayer on PC this weekend. The free play weekend started today and runs through February 25, ending at 1 PM PT / 4 PM ET.

Activision explained in a Steam post that all of your progression from the free weekend, including inventory items and unlockables, will carry forward if you purchase the full game. Activision made no mention of any limitations of the free trial like a level cap or restrictions on maps or modes.