Better than a xilinx FPGA for oak why not a GPU opencl is a c library that allowsa a GPU to be programmed in c. So maby the maple can load video or EEG or EMG data and a GPU like the one mentioned in the beagle board be used on the oak but one easier to solder. TQFP maby...
The OMAP3530 includes an HD-video capable TMS320C64x+ DSP for accelerated video and audio decoding, and an OpenGL ES 2.0 capable 2D/3D GPU. Video outputs can be provided by the on-board S-video or DVI-D (HDMI connector) outputs.