How many units GTA 6 will sell by the end of 2027?

[CosmicSex]

Zippy6 said:

Doesn't really tell us anything about total numbers but: "According to a new report from IGN, Grand Theft Auto 6 PS5 pre-orders are outselling Xbox Series X at 6 to 1."

85% of pre orders are on PS5 according to IGN.

https://www.vice.com/en/article/gta-6-preorders-on-ps5-are-outselling-xbox-6-to-1-as-retailers-warn-of-console-shortages/

How exactly would they know this though?