Hi,
the HDR60 is a pretty good platform, unfortunately not too easy to obtain. The successor (Lattice EVDK/VIP) on the other hand is up to date, there used to be promo actions where you could get them for ~199 USD, but for Ethernet/USB you'd need an extra board on top. There are a few reference designs around for MJPEG or YUV streaming to a PC (using gstreamer) or you can output to HDMI directly. However, the MIPI Sony sensors on the EVDK are a pain with timing, maybe not too fun to begin with, unless you exactly use the settings from the reference design. Also, there's no official datasheet or register documentation as far as I'm up to date.