Forza is not going to focus in pure motorsport because thats way too niche, also im my opinion they should not, i have played 4 Forza games for probably over 200 hours each and im tired of single races, i want less of them, i want them to focus in track day, cones, race againts clock, 1vs1 events with traffic, passing cars, etc.
Those are the things that are making the game feel fresh and fun for me and it sad that its soo underused in Forza 4 event list, the thing is full of the typical races. Im not againts motorsport at all, i actually want endurance races (with multi classes) back and i want real tournaments of 5 races.
Forza 4´s world tour could have been such a joy to play but stupid easy AI and the lower difficulty ruined it for me untill the last 2 seasons when the game started to get a little less easy.
I want a real competitive races, i want challenge, i want several levels of difficulty (the addaptative never worked for me, even when i was winning every by over 10-20 seconds).
I really hope Forza 5 turns out to be like Project Gotham Racing in terms of variety of game type and in challenge levels.