You can download and play BF4 for free for a week. Clock is counting 168h since your very first launch of the game, even if you don't play.
More details here
Battlefield 4 free for a week
Already got BF4, however it is cool that they give people a chance to try before buy. Imo I would love to see this with bf4 dlc's not that it is ever going to happen tho:P
Money may not buy happiness, but I'd rather cry in a ferrari than on a bus