UPDATE: It appears that the PDF novel and associated DLC may not be available Steam users outside the North America region.
Prior to the release of Metro: Last Light, I was looking through my DLC tab and nothing was there. I restarted Steam today, and while I was looking for something else, this caught my eye:
It isn’t explained to you, but if you navigate to where Steam is installed:
/Steam/steamapps/common/Metro Last Light/novel/
You’ll see the file: Metro 2033 – English text.pdf
Go ahead and copy it out to read on your PC, phone, or other devices. If it didn’t work for you, the DLC can be downloaded (for free), at: http://store.steampowered.com/app/43163/
While looking around the hub town of “Venice” in Metro: Last Light, I came across a table containing the Metro series of books. Among them was the Metro 2035 book cover. It is going to follow the same story as the video game Metro: Last Light, but covering the plot and dialogue in much greater detail and length. No release date has been announced yet for Dmitry Glukhovsky’s Metro 2035.
It’ll be interesting to see if the following series of Metro games will borrow from 2034 and 2035.