The next version of the grid is going to add a lot of new features, so will have a more expansive API, however, we know that backwards compatiilty is important, so we will seek to ensure that the upgrade path is an easy one. I can't discuss all of the new features yet, but sorting will certainly be easier in the new grid. If there are any other specific features that you are interested, feel free to get in touch with me directly (firstname.lastname@example.org).
Should you wait for the new grid? That is up to you! If you start using the current grid and buy support, you will get an upgrade as part of the package.