FWIW, my most "waterproof" lightweight Winter glove is this Montbell Climabarrier Glove at ~85g/pair bought 4 seasons ago.
Not sure what other technical fabric brand it resembles, but Montbell says this about Climabarrier, http://www.montbell.us/products/techinfo/techsys/material/material44.html
This glove is pretty warm even when inactive all the way to freezing and passes my 5min under-the-faucet "waterproof" test. The outer fabric wets out within a minute or so but the inner stays completely dry. Wet outer drys quickly though. Downside is lack of a fully reiforced palm, inhibited finger dexterity and no way to attach a leash.
Thus my interest in Montbells new OutDry rainglove. Basically a 70g uninsulated shell I could layer over any one of the lighter gloves I have.
Unfortunately for most here, Montbell does not appear to sell these outside Japan!