My wants for 4.0:
* Swimming and boat mechanics.
* 4-legged characters (just treat them like "Cars" characters where they don't use vehicles).
* Theme park ride builder.
* Disney-themed playsets. Not just for new movies (but they haven't gotten anything but Toy Box figures either), but at least 2 proper Disney-themed playsets.
* More "Best of" fan requests. The Disney line-up for 2.0 was limited, but I thought they were all solid choices. I'd like to see that again.
* I'd also like to see the same lined up for Marvel and Star Wars. Same for Muppets. Kermit and company are overdue.
* More Toy Box games like Takeover and Speedway that allow you to use every franchise.
That's basically it. Just keep refining and adding content at this point.