I keep reading about new "cutting edge" lighter fabrics coming on, but everything still seems to be the same old, same old. Goretex, its various private-brand clones and eVent (too pricey, too heavy and made without ventilation). All of it expensive. I'm sticking to my nonbreathable stuff, cut full for ventilation, or, when it's warm, just getting wet! At least my rain gear is lighter, and it doesn't wet through!
Someday there will be a truly lightweight miracle fabric that breathes extremely well, is completely waterproof in a day-long downpour and wears long enough to justify its price. I may not live that long!