The glyphosate resistant bentgrass is being developed to allow for the control of grassy weeds such as Poa annua and crabgrass. I don't know that it will need less mowing, water or disease resistance.
There are new types of turfgrass species in development all the time, and hopefully some of these will be useful to reduce maintenance. Another example is new, fine leafed strains of seashore paspalum, which is highly salt tolerant and can be irrigated with brackish water, even sea water in certain conditions.
As far as I know, there isn't one single species developed yet, or even in research, that has all the advantages of less water, disease resistance, weeding, mowing, etc.