Halliday & Matthiessen (2014: 625):
Alternatively, endophoric reference may point ‘forwards’ to the future of the unfolding text, that is, to a referent that is yet to be introduced. Thus in the following example, this guy indicates that more about this referent is to come:||| One day I was sitting in the Dôme, a street café in Montparnasse quite close to [[ where we were living]] , || and this guy walked up || and said, || “I met you in 1948 or 1949. ||| My name is Harold Humes.” ||| He said || he was starting a new magazine, The Paris News-Post, || and would I become its fiction editor. |||
This type of endophoric reference is called cataphora, or cataphoric reference.
To be clear, the cataphoric reference here is made by the demonstrative reference item this, not by the nominal group this guy.