USB 3.0 on an FPGA accelerator is probably the next step to make everyone drool.
Apollo team say that they're going to be doing a Vampire type accelerator for the big box machines but they're last on the list. They need to finish building and tuning the Vampire II for the 600 which is probably going to take them at least until the end of the year. Then for the 500. Then for the 1200.
By the time they get to the 3000 / 4000, I think that we'll just have a complete, standalone FPGA 060. They're practically already there with the Vampire II running faster than a 1260 80 Mhz with Picasso 96, HDMI output and on board SD card. They say a standalone is coming eventually but at the rate they're flying along now, I think it's coming sooner rather than later.