Oh, they'll add. But I seriously doubt they'll actually fix things to make the races interesting, and that means making the AI actually put up a fight and not simply be lap markers that you bash through, and have to continue playing the chase the rabbit scenarios Polyphony thinks makes good single player content. Which, playing a little bit of GT League in Sport as they've added to it, won't change any time soon, considering all they've changed to the AI is make them more prone (to the point of being noticeably so) to spinning out and binning it in corners.
If anything, it's been pretty obvious that Polyphony's single player philosophy of trying to make a JRPG style experience in a racing game (mainly, treating races as dungeons and the cars as your items/weapons, as it were) is hopelessly outdated and washed up, and stopped being fun in 2005 when other developers were beginning to branch out into making actual moment to moment racing interesting and fun. Because really, that's all this ' past, present and future' marketing speak is - cover for them to act like they're doing more then just transplanting a typical GT campaign into a numbered title after they told solo players to take a hike if they didn't like Kaz shoving his own head up his ass and trying to make a console rip on iRacing. And wouldn't you know it, fans took a hike alright. Enough that GT Sport was a bargain price a half year after release.
Also, if you're going to stuff words in my mouth, get it right.