How many PS3 first party titles have been release on both so far apart from MLB
XB1 - Lococycle, Zoo Tycoon and now Forza Horizon 2.
OT - Looking like a TF situation which there was quite a big difference between the two. XB1 had higher framerate to a degree, better textures, shadows, lighting, effects, higher res probably more.
Still I don't get why they would do it expect maybe it was targeted for X360 first? but was scrapped early on seeing as they haven't had a big exclusive for the X360 in a while (I guess you can count Gears:J)