I only played 2 and 3 on my 360, and, as such, I voted for 3.
What I hope for the next one is that it follows the steps of the Horizon games and also comes to Steam so I can play it. And that it's fun to play, of course.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.