No, CSI is Intel's HT, which is supposedly faster than HTT, though we'll of course have to wait to find out.
Yep, optoelectronic applicaiton of this technique is still quite a ways out from implementation.
Though, if it does come to fuition, man what an amazing result. Think about it, a single fiber optic with a point to point connection carrying 40-80 GB/s, heck forget 4S or 8S, think 16 or 32S. Compound that with 4, 8 or 16 core and imange the blade that would be built from that.