Will we be able to purchase and play the game on the PC without a steam account?

[tjf]

I see that amazon has a download version available for pre-order but I'm not sure if that downloads directly from amazon or if it also requires steam.
A physical copy would be the best option but I haven't seen any answers to that question either.

 

[Cergorach]

The description says:
Steam account required for game activation and installation