Everyone already knows it's going to be F2P in the future, if that's what you're saying (couldn't really tell, made little sense).
It has been in beta for about 9 months now. It depends if you want it or now. If you don't want to pay for it, just wait until it comes out then. The beta is not necessarily free, as in, you can't just go on Steam right now and download the game. You still need to get invited somehow, and that is limited (each week).
It has price because of it exclusivity and the demand of people wanting to buy it. People are willing to pay to play it now, even if it's going to be free in the future. Supply is limited, therefore, it has a price.
Everyone already knows that there is a chance that you CAN get it for free, it's just that people want the game now, and supply is limited.