This has been around for a while.
However, there is a school of thought that suggests that DVI should be kept as DVI, since most professional projectors and devices like the Vista Montage and Barco Encore can handle DVI natively.
http://www.gefen.com/kvm/product.jsp?prod_id=1833

I understand HD-SDI doesn't actually go as far as SD-SDI.

Hugh