I hope that, with the increase in number of available levels, we might also see an increase in the number of available plots to grow crops on. Having reached level 60, I'm pretty sure I've bought the maximum possible up to this point, 66. It would be nice to have a few more so that I don't have to rotate my crops as often (though, if this were a real working farm, it would of course be advisable to play it that way).
I also hope that there might be another crop or two to harvest at later levels, such as soy or eggplant or squash.