Mithro's comments about using Rpi Zero as an entry point for FPGA users isn't alone, Ken and I used exactly this technique with the first myStorm boards and workshops leveraging the Raspberry Pi. However things aren't quite as simple as they may first appear, there are some issues:
1) Does the user have a Raspberry Pi, unless you ship a Rpi Zero with it (They won't allow this) you are aiming at a sub market or introducing an extra requirement, this can actually turn into a barrier to entry.
2) The argument that having the tools on the Raspberry Pi makes things easier as one doesn't have to install the various parts on your mixed platform PCs also has issues (outside of the workshop context). Firstly one still has to get those on the Rpi which still means an install process (unfamiliar for non Linux users) unless one provides a ready to go SDCard with an FPGA'd Raspian which adds yet further cost and impediment to entry.. The next gotcha is that running the tools on RPi is very slow, building a soc for example takes forever compared to a laptop, so this is always a 2nd class platform for user experience.
That doesn't mean I do not like the idea of a Raspberry pi FPGA products I think the combination is very powerful, however the power isn't ease of use it's using both together at runtime and this is an entirely different proposition, thoughts?