Pete,
One of the problems with "new" grasses, is getting them out of the lab and successfully into play.
As David Fay once told me, If grasses were drugs, the FDA wouldn't let most of them out of the lab."
Subjecting grasses to wear and tear, mother nature and the unforseen is difficult to replicate in a lab.
But, one would have to think that grasses with less need for water are in the works.