Well, they're certainly not for everybody. But, for me, personally, I sleep far better in a hammock than on any pad on the ground. This winter I had mine down to 3 degrees and was quite toasty all night long.
I don't know that there's all that much that's 'new,' but certainly cuben underquilts/topquilts help lighten them up alot, as well as cuben tarps overhead. And whoopie slings have replaced adjustable straps to save a few ounces as well.
I own, and am quite fond of, the Warbonnet Blackbird hammock. Nice design, quite comfy, well made, cottage gear maker. Arrowhead Equipment makes a breathable covering (Bear Burrito Oven, because bears like a hot meal too -- gotta love humor on a website) for the Blackbird that helps in colder temps. JRB and Te-wa make great UQs (and I get my cuben UQs/TQs from enLIGHTened Equipment). MLD has a cuben hex hammock tarp, but I've having one custom made soon that will give more coverage.