Subject near and dear to my heart. If you're wondering if a low-cost PFD is going to appear out there which is substantially more full-featured/advanced from the offerings already available for Garmin and Dynon, I don't think so. The price point is just too hard to bring down from where it already lies with the bottom end of the certified market being held down by Aspen. As has been noted here I think it is unlikely Garmin will release the G3X to compete with their own G500 and even if they did the price would still be in the five-digit range. You end up jumping from the G5/Dynon up to the Aspen. We may see other offerings near or maybe even slightly below Aspen's price range (VFR? perhaps) but otherwise, you're going to either be sticking to a pretty basic EADI or moving right up to the Aspen.
It's a LOT better to buy the plane with the glass already installed.