The Embrionix are dual transmitter or dual receiver only at the moment.. And quite expensive.. $500+ a piece..
There are several manufacturers busy with getting the 12G SFP's to market.. But the high troughput without error correction is a problem they are solving right now.
(you can not use error correction on SDI video.. *Search google for pathelogical pattern sdi* ) Yes there are data sfp's with troughputs of 40Gbit and 100Gbit.. But they are no use for SDI video because of the Error correction in the SFP..
http://www.gigalight.com/news_detail/newsId=157.htmlThere is 1 brand available right now that offers 12G sfp's for video.. But still dual receiver or dual sender.. (which are probabbly the Embrionix units rebranded to AJA.
http://www.markertek.com/product/aja-fi ... ingle-modeDon't forget that 12G standard (While BMD already makes 3 years of 12G products..) The standard is officially released in 2015 as far as i can find.. So the market will slowly adopt that standard. (or not! Sony said they will never go to 12G.. Rather use 4x 3Gsdi for 4K or go IP..)
So give it some time or be the first adopter and buy the AJA/Embrionix modules and give a feedback if it works on the BMD gear..
If you need 4K hdmi there are several options beside BMD that are readily available..