So, to summarize the consensus emerging from 0z runs (as much as such a thing exists)...
Storm starts Saturday evening in the greater DC metro area. Front end thump looks powerful. Will almost certainly mix during the day on Sunday. May turn back to snow later on Sunday if the event goes long. QPF numbers look encouraging, 1.3-1.5 inches a good bet for most of the region. Due to sleet loss, ~8 inches of snow seems like a reasonably safe bet for DC metro and points west and north, with 12 being very possible, especially as you go more west and north. Could exceed those numbers if mixing is delayed or if the ratios are great due to cold temps at the outset. But also some remote bust scenarios exist (in terms of total snow accumulation) because the cutoff line is drawing closer and closer to DC/I-95.
Fair? Any suggested revisions?