This is a big deal if it means what I think it means. AI has long been the weak point of the Gran Turismo series, with only minor improvements in Sport that weren't enough to seriously challenge most players. PD has often attempted to mask the issue by having the player start well behind the lead car in races, but this only turned such races into glorified time trials, nicknamed "catch the rabbit" races.
Whilst some news outlets are tempering expectations regarding this announcement, Kazunori Yamauchi himself has been quoted as promising an AI improvement for GT7, and it seems odd to me that a project like this, combined with a study from last year, wouldn't be used to help GT catch up to the standard that other modern franchises have set in the CPU racing department.